Dr. Pletser’s experience includes 30 years of working with the European Space Agency as a Senior Physicist/Engineer and coordinating their parabolic flight campaigns, and he is the Guinness World Record holder for the most number of aircraft flown (12) in parabolas, personally logging more than 7,300 parabolas.
\\n\\n
Seeing the 5,000th book published makes us at the same time proud, happy, humble, and grateful. This is a great opportunity to stop and celebrate what we have done so far, but is also an opportunity to engage even more, grow, and succeed. It wouldn't be possible to get here without the synergy of team members’ hard work and authors and editors who devote time and their expertise into Open Access book publishing with us.
\\n\\n
Over these years, we have gone from pioneering the scientific Open Access book publishing field to being the world’s largest Open Access book publisher. Nonetheless, our vision has remained the same: to meet the challenges of making relevant knowledge available to the worldwide community under the Open Access model.
\\n\\n
We are excited about the present, and we look forward to sharing many more successes in the future.
\\n\\n
Thank you all for being part of the journey. 5,000 times thank you!
\\n\\n
Now with 5,000 titles available Open Access, which one will you read next?
Preparation of Space Experiments edited by international leading expert Dr. Vladimir Pletser, Director of Space Training Operations at Blue Abyss is the 5,000th Open Access book published by IntechOpen and our milestone publication!
\n\n
"This book presents some of the current trends in space microgravity research. The eleven chapters introduce various facets of space research in physical sciences, human physiology and technology developed using the microgravity environment not only to improve our fundamental understanding in these domains but also to adapt this new knowledge for application on earth." says the editor. Listen what else Dr. Pletser has to say...
\n\n\n\n
Dr. Pletser’s experience includes 30 years of working with the European Space Agency as a Senior Physicist/Engineer and coordinating their parabolic flight campaigns, and he is the Guinness World Record holder for the most number of aircraft flown (12) in parabolas, personally logging more than 7,300 parabolas.
\n\n
Seeing the 5,000th book published makes us at the same time proud, happy, humble, and grateful. This is a great opportunity to stop and celebrate what we have done so far, but is also an opportunity to engage even more, grow, and succeed. It wouldn't be possible to get here without the synergy of team members’ hard work and authors and editors who devote time and their expertise into Open Access book publishing with us.
\n\n
Over these years, we have gone from pioneering the scientific Open Access book publishing field to being the world’s largest Open Access book publisher. Nonetheless, our vision has remained the same: to meet the challenges of making relevant knowledge available to the worldwide community under the Open Access model.
\n\n
We are excited about the present, and we look forward to sharing many more successes in the future.
\n\n
Thank you all for being part of the journey. 5,000 times thank you!
\n\n
Now with 5,000 titles available Open Access, which one will you read next?
\n'}],latestNews:[{slug:"stanford-university-identifies-top-2-scientists-over-1-000-are-intechopen-authors-and-editors-20210122",title:"Stanford University Identifies Top 2% Scientists, Over 1,000 are IntechOpen Authors and Editors"},{slug:"intechopen-authors-included-in-the-highly-cited-researchers-list-for-2020-20210121",title:"IntechOpen Authors Included in the Highly Cited Researchers List for 2020"},{slug:"intechopen-maintains-position-as-the-world-s-largest-oa-book-publisher-20201218",title:"IntechOpen Maintains Position as the World’s Largest OA Book Publisher"},{slug:"all-intechopen-books-available-on-perlego-20201215",title:"All IntechOpen Books Available on Perlego"},{slug:"oiv-awards-recognizes-intechopen-s-editors-20201127",title:"OIV Awards Recognizes IntechOpen's Editors"},{slug:"intechopen-joins-crossref-s-initiative-for-open-abstracts-i4oa-to-boost-the-discovery-of-research-20201005",title:"IntechOpen joins Crossref's Initiative for Open Abstracts (I4OA) to Boost the Discovery of Research"},{slug:"intechopen-hits-milestone-5-000-open-access-books-published-20200908",title:"IntechOpen hits milestone: 5,000 Open Access books published!"},{slug:"intechopen-books-hosted-on-the-mathworks-book-program-20200819",title:"IntechOpen Books Hosted on the MathWorks Book Program"}]},book:{item:{type:"book",id:"1800",leadTitle:null,fullTitle:"Ergonomics - A Systems Approach",title:"Ergonomics",subtitle:"A Systems Approach",reviewType:"peer-reviewed",abstract:"This book covers multiple topics of Ergonomics following a systems approach, analysing the relationships between workers and their work environment from different but complementary standpoints. 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\r\n\tNeoplasia is considered to be the result of aberrations in the homeostatic mechanisms regulating cell turnover. This may be due to a combination of genetic, epigenetic and stochastic factors. Drug resistance is one of the major reasons for treatment failure and tumor relapse. Hence, an improved understanding of the mechanisms of neoplastic growth is possible based on systematic cataloging of the druggable targets for each of the major hallmarks of cancer. This approach can also aid in the refinement and validation of the in vitro and in vivo models, as well as provide pointers for the development of novel systems. Genomic instability and mutation, as well as tumor-promoting inflammation should be included as underlying factors influencing the process of neoplasia along with factors dysregulating energetics. The focus of this book is to update the reader on an integrated perspective including epigenetics data and corroborative mechanistic evidence from multiple model systems including humans. This will enable the reader to better comprehend the current scenario in terms of the pharmacological aspects pertaining to cancer chemoresistance. Also, the challenges for the molecular oncology will be discussed as well as probable strategies and a road-map for cancer chemotherapeutic drug development.
",isbn:null,printIsbn:null,pdfIsbn:null,doi:null,price:0,priceEur:null,priceUsd:null,slug:null,numberOfPages:0,isOpenForSubmission:!1,hash:"2a80fe34c552bb6ca76ef9cd8f21e377",bookSignature:"Dr. Suresh P.K.",publishedDate:null,coverURL:"https://cdn.intechopen.com/books/images_new/8640.jpg",keywords:"Molecular Mechanisms of Aberrations, Proliferation Mechanisms, Types of Cell Death, Signal Transduction Pathways, Angiogenesis in Cancer, Angiogenesis in Wound Healing, Molecular Mechanisms of Invasion, Molecular Mechanisms of Metastasis, Telomeres, Stem Cells, Delivery Challenges, Evasion Mechanisms",numberOfDownloads:null,numberOfWosCitations:0,numberOfCrossrefCitations:0,numberOfDimensionsCitations:null,numberOfTotalCitations:null,isAvailableForWebshopOrdering:!0,dateEndFirstStepPublish:"November 5th 2018",dateEndSecondStepPublish:"November 26th 2018",dateEndThirdStepPublish:"January 25th 2019",dateEndFourthStepPublish:"April 15th 2019",dateEndFifthStepPublish:"June 14th 2019",remainingDaysToSecondStep:"2 years",secondStepPassed:!0,currentStepOfPublishingProcess:5,editedByType:null,kuFlag:!1,biosketch:null,coeditorOneBiosketch:null,coeditorTwoBiosketch:null,coeditorThreeBiosketch:null,coeditorFourBiosketch:null,coeditorFiveBiosketch:null,editors:[{id:"190244",title:"Dr.",name:"Suresh",middleName:null,surname:"P.K.",slug:"suresh-p.k.",fullName:"Suresh P.K.",profilePictureURL:"https://mts.intechopen.com/storage/users/190244/images/system/190244.jpeg",biography:"P.K. Suresh is a Professor at the School of Biosciences & Technology, VIT, Vellore (2009 to date). He has approximately 18.5 years of teaching, research and administrative experience in Biotechnology & Industrial Biotechnology and allied disciplines. He had also headed Biotechnology & Industrial Biotechnology departments and has handled a wide variety of theory papers. He has 45 research publications in SCOPUS-indexed journals and has completed 3 funded projects as the Principal Investigator. He has made several presentations at International conferences. He has guided 5 doctoral students (2 as co-guide) and is currently guiding 5 students in the doctoral program. 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1. Introduction
Salmonella enterica subspecies enterica can be separated into more than 2400 antigenically different serovars and the pathogenicity of most of these serovars is unspecified. The greater number of incidents of salmonellosis in humans and domestic animals originated from relatively few serovars and these can be separated into three groups on the basis of host prevalence. Host-specific serovars are the first group. These typically result in systemic disease in a small number of phylogenetically connected species. For example, S. enterica serovar Abortus ovis, serovar Paratyphi and serovar Pullorum are almost exclusively associated with systemic disease in sheep, fowl and humans, respectively. Host-restricted strains are the second group. These are mainly connected with one or two closely related host species but may also unusually result with disease in other hosts. For instance, S. enterica serovar Choleraesuis and serovar Dublin are generally associated with severe systemic disease in pigs and ruminants, respectively [1]. Nevertheless, these serovars are possibly efficient of infecting other animal species and humans. The third group comprises of the extensive S. enterica serovars, such as Infantis and Enteritidis that usually induce gastroenteritis to a large extent of unrelated host species. Obviously the nature and rigidity of Salmonella infections in different animal species varies hugely and is affected by many factors including the Salmonella serovar, dose, age, strain virulence, host animal species, immune status of the host and the geographical region [2].
Salmonella enterica subsp. enterica remains a main cause of infection and disease in human and animals worldwide. Much of the public health and economic problem originated from diseases or infected animals carriage. In Europe, animal salmonellosis as a cause of human infection became increasingly important as agricultural production started to intensify after World War II. In the 1950s, the rapid intensification of the poultry industry in numerous countries was supported by importation of dried fish meal from South America which comprised many Salmonella serovars. So, non-typhoidal salmonellosis is one of the leading causes of acute bacterial gastroenteritis in the USA, responsible for an estimated 1.4 million cases of illness annually. Widespread commercial distribution of contaminated foods can sometimes involve huge numbers of consumers in Salmonella outbreaks. For example, a 1994 S. Enteritidis outbreak associated with ice cream in the USA affected 224,000 people. Salmonella outbreaks can particularly have severe consequences for highly vulnerable populations in facilities such as day care centres and nursing homes [3, 4].
Although the genus Salmonella consists of more than 2400 serovars, most human cases of salmonellosis in the USA are caused by 5–8 serovars. United States (US) Centers for Disease Control and Prevention (CDC) reported that approximately 60% of human cases were caused by Salmonella enterica ser Enteritidis (24.7%), S. ser Typhimurium (23.5%), S ser Newport (6.2%) and S ser Heidelberg (5.1%). These same four serovars represented 46.4% of the isolates from nonhuman sources that year. Also serotypes are changing with time, for example, CDC reported that many of Salmonella serotypes decreased in incidence compared with 2012, infections caused by serotype 4, [5],12;I:- continued to rise [5].
Salmonella ser Enteritidis infections are mostly seen with fresh shell eggs and egg products, in which the bacteria contaminate the interior essences of the egg through transovarial infection. Salmonella ser Enteritidis infects the ova or oviduct of the hen’s reproductive tract, which causes contamination of the albumen, vitelline membrane and possibly the yolk. Internal contamination of the egg’s content performs egg-sanitizing practices, which focus on decreasing pathogen contamination on the eggshell surface, ineffective.
Salmonella Typhimurium definitive phage type DT104 appeared in the early 1990s as the dominant type of Salmonella spp. Most isolates have chromosomally encoded resistance to five antimicrobials, specifically sulfonamides, chloramphenicol, ampicillin, streptomycin and tetracycline (R-type ACSSuT). There is sign that some penta-resistant DT104 strains are also evolving resistance to quinolones and trimethoprim [6]. Evidence in Europe indicates that the emergence of DT104 in cattle was the harbinger to its spread to other animals used for food production [2].
Although DT104 is currently the dominant penta-resistant clone of S ser Typhimurium, many other phage types (DT29, DT204, DT193 and DT204C) of this serovar have also be seen with multi-drug resistance. Understanding the causes that influence the emergence of these prevalent serovars of Salmonella spp. and the factors leading to the distribution and persistence of Salmonella spp. in animals is beneficial for the occurrence of effective intervention strategies to decrease human exposure to salmonellae [7].
Forms of livestock production and movement are varying as the world is changing. Advanced wages in the West conclude in increased production and importation of poultry meat and processed products from countries in South America and Asia. An improved standard of living in many countries is attended by increased meat ingestion, chiefly pork and poultry but also beef and dairy yields. Regulation of meat production in many countries is improving but there are presently large problems of antibiotic resistance which is enhancing a global problem. Poor control and hygiene conclude in the transmission of many microorganisms of which Salmonella is just one. Other changes connected with increasing living standards in world contain the increasing importance of companion animals in people’s lives which are adequately recognized as sources of infection. Correlated to global changes in trade and human populations, improvements in technology have allowed us to obtain an unprecedented understanding of the biology of Salmonella [7].
However, many aspects of Salmonella biology and infection biology remain tantalizingly unresolved after the last 10 years of research, and more than 50 years after Professor Buxton’s book [8] acted, such that the Salmonella should stay the centre of worldwide investigation activity for many more years. In many details the study of this organism is now a global project. Shrinking investigation budgets in the West have been changed with increasing concern in those countries with increasing budgets and where a value of the animal and public health Salmonella problem is increasing [7].
2. Infection in animals
Salmonella infections occur in lizards, snakes and turtles (including tortoises), in birds such as parrots, canaries, finches and pigeons and in mammals such as dogs and cats. They are less common in small caged animals. In dogs, cats and reptiles, infection may be unapparent and salmonellae can be found in the faeces of normal animals. These organisms can live happily in the intestine of some animals. They are called carrier animals. Salmonella infections most often cause enteritis and diarrhoea. The bacteria can also invade the body to cause septicaemia. This invasion results in fever that commonly accompanies the enteritis caused by Salmonella infection. Affected animals are lethargic, do not eat and have diarrhoea. The diarrhoea is often not distinguishable from that caused by other microbes. The diarrhoea may be profuse and normally house-trained dogs and cats may become incontinent and foul the house unintentionally. In birds, the illness can be less apparent and may only be seen as pasting of the vent.
Very young, old or immunosuppressed animals or birds may be severely affected by the dehydration accompanying the diarrhoea, develop septicaemia or even die. Survivors may have diarrhoea for a time, but most go on to recover completely. Any recovering animal may be a carrier for a varying length of time. The organism can live in the gut lining in small numbers and within local lymph nodes, particularly in the lymphoid areas such as the caecum of birds. Persistence inside the animal can lead to reappearance of infection if the animal develops a different disease [9].
3. Salmonella infections in the domestic fowl
Four diseases induced by Salmonella are significant in poultry; pullorum disease caused by Salmonella enterica serovar Pullorum, fowl typhoid (FT) caused by S. Gallinarum, paratyphoid caused by several serovars and subspecies of Salmonella most particularly S. Typhimurium, S. Enteritidis, S. Infantis to name a few and arizonosis caused by S. enterica subsp. arizonae [7]. The poultry’s specific S. enterica serovars Gallinarum and Pullorum have mostly been eradicated from the industries of Europe and North America. Nevertheless, in parts of the world with less developed industries, and especially in systems with poor bio-security, these serovars still represent larger threats to bird health and welfare. Even though chickens are the normal hosts of S. enterica serovars Gallinarum and Pullorum, natural outbreaks induced by these serovars have been explained in turkeys, guinea fowl and other several species. There are many sources of infection in poultry containing vertical transmission, contaminated feed and the environment. Asymptomatic excreting of Salmonella from the intestine causes the contamination of eggs concluding in vertical transmission. As soon as after hatching, oral intake by the chicks results in very high numbers of Salmonella in the gut and great shedding in the faeces. This causes rapid horizontal spread around the hatchery [2].
Domestic fowl compose one of the largest reservoirs of Salmonella and is significant as a risk to public health through consumption of polluted eggs and meat. Arizonosis caused by S. enterica subsp. arizonae is an egg-transmitted infection mainly of young turkey poultries that still happens sporadically in commercial flocks and which may as well infect and unusually induce disease in chickens or other species of birds. Reptiles can be a reservoir of S. arizonae for birds and for man. The bacteria to place in the ovary and oviduct of breeder turkeys and the poults hatched from infected breeders develop disease. The disease is described by diarrhoea with pasting of faeces in the vent, huddling near the heat source, anorexia and boosted mortality sometimes accessing 50% [10].
4. Salmonella infection in poultry
Poultry products are frequently identified as important sources of salmonellae that cause human illness. An estimated 182,060 Americans became infected with S. Enteritidis during 2000 after consuming contaminated eggs [11]. Approximately 80,010 of S. Enteritidis outbreaks occurring in the USA between 1985 and 1999 with an identified food source were attributed to eggs [12]. Eating contaminated chicken has also been identified as a significant risk factor for S. Enteritidis infection [13]. Illustrating the importance of poultry as a reservoir for the transmission of salmonellae to humans, many of the serotypes that are most prevalent in humans (such as S. Typhimurium and S. Enteritidis) are also found common in poultry [4].
The ability of Salmonella to cause disease in poultry is closely related to the infecting serovar and the age and genetic background of the bird. Fowl typhoid (FT) is a disease caused by S. enterica serovar Gallinarum that is usually transmitted by the oro-faecal route and mainly affects adult birds [2]. The first described outbreak of FT was characterized by high mortality, especially during the first 2 months of the outbreak [7]. The pullorum disease (PD) is caused by S. enterica serovar Pullorum, is egg transmitted and occurs primarily in the first few days of life, high numbers of dead-in-shell chicks are seen (white bacillary diarrhoea). The ability of serovars other than Gallinarum and Pullorum to cause disease is relatively poorly understood [2].
Poultry may be infected with a wide variety of Salmonella serovars with the infection largely confined to the gastrointestinal tract with faecal excretion [7]. S. enterica serovar Typhimurium is primarily known for producing clinical salmonellosis in very young birds. Mortality rates vary enormously, from less than 10% to more than 80% in severe outbreaks. Resistance to infection develops rapidly over the first 72 hours of life and has been attributed to maturation of macrophages and the development of a commensal flora in the gut leading to competitive exclusion of Salmonella [7]. Strains of S. enterica serovar Enteritidis are also highly virulent for young chicks [14]. S. enterica serovar Enteritidis, and in particular strains of phage type 4 (PT4) can also cause asymptomatic and chronic infections in older birds including commercial layers and broiler breeders [15, 16, 17]. Epidemiological data demonstrate a clear association between food poisoning caused by serovar Enteritidis PT4 and the consumption of undercooked eggs [18]. The extent to which egg contamination occurs before or after egg formation is unclear [2].
Many S. enterica serovars have been associated with food poisoning in humans, however the potential for such serovars to infect poultry has been little studied in controlled experiments. A chick isolate of S. enterica serovar Kedougou colonized the gut, but did not intrude on the mucosa of tentatively infected day old chicks [19]. Likewise, strains of serovars Heidelberg, Senftenberg, Infantis, Montevideo and Menston all expeditiously colonized the intestines of youth birds, but were less invasive than a strain of serovar Typhimurium [20]. Lately, the virulence of various different serovars of Salmonella was evaluated in day old specific pathogen-free chicks. The host-specific serovar Pullorum affirmed to be the most virulent, pursued by the omnipresent serovars Typhimurium and Enteritidis. Three out of the four strains of serovar Heidelberg made low levels of mortality, whereas birds infected with isolates of Kentucky, Hadar and Montevideo all lived. Nevertheless, these latter serovars all colonized the intestines expeditiously and caused a reduction in body weight, showing that subclinical Salmonella infections can even be harmful to bird health, welfare and productivity [21]. The reasons why such serovars are clearly much less virulent in chicks, yet retain the ability to induce human food poisoning are not seen [2].
5. Salmonella infections in cattle
Salmonella infections are an important cause of mortality and morbidity in cattle and subclinically infected cattle are frequently found. Cattle thus constitute an important reservoir for human infections. There have been numerous reviews over the years [22] increasingly reporting about multi-drug resistant strains [23] as well as the importance of Salmonella for the food industry. Interestingly, despite decades of research into salmonellosis, the disease and its public health consequences are not really resolved [7]. Salmonellosis occurs worldwide in cattle and has been associated primarily with serovars Dublin and Typhimurium. Other serovars are sporadically associated with bovine infections [2]. During the period 1968–1974, Sojka et al. [1] recorded the isolation of 101 different Salmonella serovars, usually at a low prevalence, detected annually in cattle [7]. Salmonellosis reached a peak in the British cattle industry in the 1960s with over 4000 incidents in 1969 [1, 2]. In the USA, 48% of the 730 Salmonella, other than S. Dublin and S. Typhimurium, isolated from cattle were represented by 7 serovars [24]. In the UK, in 2009, there was 10 Salmonella reports of non-GB origin reported from cattle, these included S. Typhimurium DT104, S. Mbandaka, S. Anatum and S. Dublin, clearly showing that importation of new strains remains a constant risk [7].
In the recent times, there has been a sharp reduction in the number of Salmonella outbreaks and over the last 5 years there have been only 400–500 cases annually, with similar numbers of events caused by S. enterica serovar Typhimurium and serovar Dublin in adult cattle and calves. S. enterica serovar Dublin and serovar Typhimurium are endemic in northern Europe, despite the divisions of these serovars vary. The origin of most outbreaks of salmonellosis in cattle is possibly faecal to oral contact. Infected cattle may excrete up to 108 CFU Salmonella/g of faeces and pollution of the environment in the nearness of other animals is a potent source of infection. Subclinical discharge of Salmonella aggravates the problem of pollution. Cattle that discharge an active Salmonella infection but show no clinical symptoms (often convalescing animals) are known as “active carriers”. These may spread Salmonella constantly in quantity greater than 105 cfu/g of faeces and thus can be determined by routine bacteriological examination. Active carriage is commonly the sequel to clinical enteritis or systemic infection, and infected animals may excrete Salmonella for years or as well for life. “Passive carriers” are immunized animals that swallow Salmonella with feed and subsequently pass them in their faeces with no active infection of the intestines. Hence, when eliminated from a dirty environment these animals will stop excreting Salmonella. “Latent carriers”, Salmonella remains subclinically in the tissues but is just randomly excreted in faeces [2]. Excretion may be initiated by stress, for example, at parturition. Understanding the biology of this true “carrier state” is likely to be key to ultimately controlling this important pathogen in cattle and may also provide insight into, for example, the asymptomatic carriage of S. enterica serovar Typhi by humans [7].
The spread of S. enterica serovar Dublin to reproductive tissues is not well understood and may originate either from a systemic infection or possibly from faecal contamination of the vagina. Adult survivors of S. enterica serovar Dublin infections often become latent carriers, a state which may last for life. The outcome of infection with other serovars seldom results in the latent carrier state although active excretion may continue for years. The reasons for this remain unclear [2].
6. Salmonella infections in pigs
The organism now known as Salmonella enterica serovar Choleraesuis was first isolated from pigs by [25], when they considered it to be the cause of swine fever (hog cholera). The ability of Salmonella to cause disease in pigs depends on numerous factors including the infecting serovar and the age of the pig. Regional variation in salmonellosis incidence is loosely correlated to pig density, husbandry practices and co-mingling of pigs [7]. The serovars of Salmonella associated with clinical disease in pigs can be divided into two groups: the host-restricted serovars typified by S. Choleraesuis and the ubiquitous serovars typified by S. Typhimurium. Then the existence of S. Choleraesuis has diminished dramatically and it is now only isolated sporadically. In contrast, this serovar stays a major threat to the pig industry in the USA. The fall of serovar Choleraesuis in the UK was not linked with any specific intervention measure. It was later understood that a diversity of antigenically distinct S. enterica serovars can be isolated from pigs, some of which are of zoonotic as they transferred through the food chain and farm environment to humans, where they typically cause acute but self-limiting gastroenteritis [8]. S. Typhimurium is the most usual serovar isolated from pigs both in Europe and in the USA. Likewise, S. Derby has a strong linked with pigs on both sides of the Atlantic Ocean, and for the past 20 years it has been the second most predominant serovar in pigs in the UK. Oral ingestion is thought to be an important route of infection as Salmonella are shed in high numbers in the faeces of clinically infected pigs.
Consistent results are only received applying a lower portion if the gastric pH is first neutralized with antacids [26]. This showed that the low pH of the stomach is a productive barrier to infection by Salmonella. Aspiration of infected material into the upper respiratory tract is another possible route of infection. Pneumonia is a general feature of S. Choleraesuis infections in pigs [27] and several works have shown that pigs can be experimentally infected by intranasal inoculation. Pigs infected with S. Choleraesuis via the intranasal route improve more severe clinical signals than those infected via the oral route [28]. Together these observations indicate that the tonsils and lungs are likely to be significant sites of invasion. Clinical salmonellosis in pigs is standardly of two forms; septicaemia caused by host limited S. enterica serovars such as Choleraesuis, and enterocolitis originated by broad host limit serovars such as Enteritidis. Unsurprisingly, weaned pigs that are intensively reared are most often influenced by Salmonella infections. Like other host-specific serovars, S. Choleraesuis has the capacity to induce disease in both young and older animals, whereas S. Typhimurium typically lead to disease in pigs aged between 6 and 12 weeks, but seldom in adult animals. In older animal, subclinical infections with S. Typhimurium are frequent, leading to high transmission rates if active carrier animals are not detected. S. Choleraesuis typically cause septicemic forms of infection. S. Typhimurium typically causes enterocolitis [2].
A year-long work during 2006–2007 determined Salmonella in the ileocaecal lymph node of 21.2% of pigs at slaughter in the UK, with S. Typhimurium by far the most dominant serovar. This correlated to a usual across Member States of the European Union of 10.3% [29]. European Community-wide it is estimated that 10–20% of human non-typhoidal salmonellosis may be linked to pigs [30]. In the USA, the most common serovars isolated from pigs during the National Animal Health Monitoring Survey in both 2000 and 2006 were Typhimurium, Derby, Agona, Typhimurium-Copenhagen and Heidelberg, three of which were also in the top five serotypes isolated from humans in the same period [31]. The number of investigation of some other serovars has developed during the last 20 years, but it is not understood whether this is the result of better monitoring or whether it indicates increased disease or environmental prevalence. It is evident that the problem of Salmonella in pigs is not limited geographically, and this is valuable considering the range of global trade in pork as personal countries are no longer isolated from world events [7].
7. Salmonella infections in sheep
In most countries of the world with a large sheep population, including the UK, Australia, New Zealand and the USA, sheep salmonellosis is apparently rare and does not represent a relevant economic issue. Disease distribution and prevalence of infections due to ubiquitous serovars is typically seasonal and associated with animal movement and shipping [32, 33]. Exposition to prolonged environmental stress, including cold, poor nutrition and concurrent diseases, might be important to activate latent infection and Salmonella shedding in faeces [33].
Serovar Abortus ovis strains, being host restricted to ovines, are expected to be introduced into a flock by an infected sheep and transmitted by the faecal-oral route [34]. There is no convincing proof of bacterial spread by water, feed or other host’s faeces. Therefore, precaution has to be taken when transferring animals from a flock with history of infection into non-infected ones. Particularly, while many authors have published faecal shedding of culturable infectious bacteria up to 3 months following abortion [35], S. Abortus ovis DNA has also been detected in faeces up to 12 months from abortion [36], suggesting that sheep may be long-term asymptomatic carriers. Experimental infection studies have demonstrated that sheep may become infected by the conjunctival and vaginal routes [34, 35], but their significance in natural transmission has not been evaluated. Due to serovars Dublin, Abortus ovis and others induce pneumonia in young lambs, infection of grazing animals because of the nasal path might also be possible and respiratory secretion may distribute the infection to other individuals. High bacterial load in aborted foetuses and discharged placenta, elimination of bacteria with vaginal emissions following abortion and by scouring lambs are the main source of transmission throughout a flock during the lambing season [36].
Examination of slaughter-age healthy sheep and identification of Salmonella species have been often reported in the past few years, due to public health concerns of these serovars entering the human food chain [37]. Ovine salmonellosis might be an important zoonotic reservoir for human infection and a number of studies have reported food-borne transmission to humans [30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40].
8. Salmonella infections in horses
By the 1950s, Salmonella enterica serovar Abortus equi had disappeared from the USA following widespread use of bacterin and other control measures. The non-host adapted serovar S. Typhimurium was first recognized as a cause of colitis in 1919 [41] and has since dominated globally as a cause of equine salmonellosis. Antibiotic usage in combination with stressors associated with hospitalization has proved to be potent influences in increasing susceptibility of the horse to invasion by Salmonella spp. and in selection of resistant strains. Anorexia, antimicrobial administration, intestinal surgery and marked changes in diet increase the susceptibility of horses to Salmonella challenge [42].
Salmonella Abortus equi, the cause of equine paratyphoid, is the sole Salmonella host adapted for equids. A notable feature of the epidemiology of equine salmonellosis in the USA has been the rise and fall in incidence of infection by specific serovars. This may result in growing of herd immunity and/or reduction of virulence of the specific serovar. The latter may be conducting by the choosing pressure of antibody as herd immunity progresses. Topical spikes in the rate of isolation of particular serovars is often correlated with nosocomial outbreaks in local veterinary hospitals where in there is improved transmission. Control methods including closure of affected facilities will decrease the number of new cases finally providing to disappearance of the epidemic serovar.
The widespread dispersion of Salmonella spp. in wild and domestic animals and their environment is an important barrier to the persistence of a Salmonella-free horse population on a farm or following admission to a veterinary hospital. The origin of infection is often not understand in the first stages of an outbreak and so primary control efforts must be focused on rigid isolation of clinically problematical animals with diarrhoea or colic or those known to be shedding Salmonella spp. control measures on farms differ in some significant considerations from what are needed in a hospital environment [7].
9. Salmonella infections in dogs and cats
Carriage of Salmonella in dogs and cats may be asymptomatic, with intermittent shedding. Disease occurs intermittently, and ranges from mild to severe gastroenteritis, with occasional occurrence of abortion, systemic spread or septicaemia [43]. Recovered animals may shed Salmonella for several weeks, and chronic carriage with periods of recrudescence is possible. The challenges joined with making a diagnosis of bacterial associated diarrhoea in the lack of objective advices for faecal testing and the fact that identical isolation ratio have been found for presumed bacterial entero pathogens in some populations of animals with and without diarrhoea [44]. Both selective and non-selective serovars have potential for zoonotic spread, and may also be important in the emergence of antimicrobial resistance in the bacterial population [45]. Most of the infections were clinically silent, but mild diarrhoea without fever developed in only nine dogs from one kennel. Latest studies have demonstrated dogs eaten raw meat diets can go on to shed the organism in the faeces for a while time. Twenty-eight research dogs were entered to detect the prevalence of Salmonella shedding after ingestion of a Salmonella-contaminated commercial raw food diet meal [46]. Cats have also been detected to carry Salmonella. Studies of the prevalence of Salmonella shedding in normal, asymptomatic cats have identified a prevalence typically of between 0.8 and 2.1% in cats [47, 48]. The epidemiology, prevalence, clinical signs, diagnosis and pathological findings and sources of salmonellosis in 100 cats in Scotland and England during 1955–2007 were reported [49]. Of the 49 isolates, 28 (57%) were from kittens less than 6 months of age. From the point of their function in the transmission of salmonellosis, cats were discovered to be the most abundant ecological section (125 of all samples positive) in a 2-year investigation of the circulation of Salmonella on 12 pig production units in the USA [50]. In addition, the presence of cats on the farm was identified as a significant risk factor for outbreaks of clinical salmonellosis on Dutch dairy farms [51]. Tauni and Osterlund [52] reported an outbreak of S. Typhimurium in cats and humans connected with infection in wild birds in Sweden in 1999. A total of 62 ill cats were investigated. Altogether were anorectic and lethargic, 31% had diarrhoea and 57% were vomiting. It was thought similar that salmonellosis was passed on from cats to humans, but there were just a few such cases. These studies indicate that Salmonella shedding is comparatively sporadic in cats and that clinical signals such as diarrhoea are not trusted predictors of whether a cat is potently shedding enteric organisms. Nevertheless, when infection does happen, cats may take part in a significant role in the transmission of the organism. That is, the prevalence of Salmonella spp. in healthy dogs and cats is very similar to the prevalence in diarrhoeic dogs and cats while the prevalence in stray or kennelled dogs and cats is often higher. The prevalence of Salmonella infection in kennelled or stray cats and dogs is often excessive. Most events of salmonellosis in dogs and cats are subclinical. Following contact to Salmonella, the organism is usually discharged by the host’s immune system. Nevertheless, in a small rate of cases the organism may continue leading to the formation of a transmitter state. A small percentage of cases of human salmonellosis are related to contact with infected dogs and cats.
10. Salmonella infections in exotic pets
Reptiles are known to release Salmonella frequently [53] and reptile-associated salmonellosis has been recognized as an emerging zoonosis. From the epidemiological point of view [54] and in addition to an earlier recommendation (‘Reptile-Associated Salmonellosis’, RAS, [55] we suggest to call this particular type of epidemic ‘Reptile-Exotic-Pet-Associated Salmonellosis’ (REPAS). The primary statement for this proposal is that past several years the approach of trading reptiles has changed substantially and this will likely continue in the future. The particular risk of Salmonella dissemination from reptiles to humans is not due to European wild species but, as outcome of this study also demonstrate, at present is mainly due to ‘exotic’ imported reptile species. Moreover, following new investigations Salmonella shedding is higher in reptiles kept in captivity in comparison to wild reptiles [53, 56] and ‘pet’ reptiles are apparently in closer contact to humans. These arguments justify the inclusion of ‘exotic pet’ into the term describing the problem. The risk to human health connected with the reptile pet market has been highlighted recently [57] and the exact definition of the problem using REPAS might be significant to contribute the problem in education and support the European Commission to contribute suggestions to harmonize animal welfare and public health [7].
Each year infections are also obtained through direct or indirect animal contact in homes, farm environments, veterinary clinics, zoological gardens, or other public, professional or private settings. Clinically infected animals may propagate a higher prevalence of shedding than seemingly healthy animals, but both can exhibit Salmonella over long periods of time. Also, environmental contamination and indirect dissemination through contaminated food and water may complex control efforts. The public health risk varies by mammals, birds and reptile species, age group, husbandry practice and health status [58]. A study from Canada conducted between 1994 and 1996 illustrated the potential problem of reptile-associated salmonellosis for the first time. In 2011, a 13-month-old child from Austria passed away on the transport to the hospital with vomiting and diarrhoea. A multi-state outbreak in the USA in 2008 was associated with pet turtle exposure. In nearly half of the 135 cases, children ≤5 years were affected. This outbreak was the third turtle-associated outbreak since 2006 [59].
11. Salmonella detection
Diagnosis is based on the identification of the Salmonella either from faeces or from tissues collected aseptically at necropsy, environmental samples or rectal swabs, feedstuffs and food products; prior or current infection of animals by some serovars may as well be detected serologically. If reproductive organs are infected, abortion or conceptus occurs, it is essential to culture vaginal swabs, placenta, foetal stomach contents and embryonated eggs. Organism may be identified using a diversity of techniques that may include pre-enrichment to resuscitate sublethally damaged salmonellae, enrichment media that comprise inhibitory substances to inhibit competing organisms, and selective agars to differentiate salmonellae from other enterobacteria. Various biochemical, serological and molecular tests can be used to the pure culture to allow for a reliable verification of an isolated strain. Organism has antigens named somatic (O), flagellar (H) and virulence (Vi), which may be identified by special typing sera, and the serovar may be assignated by reference to the antigenic formulae in the Kauffman-White scheme. Many laboratories may require to send isolates to a reference laboratory to ensure the full serological identity and to verify the phage type and genotype of the strain, where suitable [60].
Serological tests should be carried on a statistically representative sample of the population, but results are not at all times signifier of active infection. In the laboratory, the tube agglutination test is the procedure of choice for export and diagnostic plans for samples from all species of farm animals. Enzyme-linked immunosorbent assays are usable for some serovars and may be used for serological diagnosis and observation, especially in pigs and poultry. Vaccination may risk the diagnostic worth of serological tests [60].
Since some of the common serovars such as S. Enteritidis and S. Infantis not only solely induce human infections but are also important livestock colonizers, the Salmonella subclassification needs more discriminative methods than serotyping. During the past 50 years, phage typing gets a very worthful device for epidemiological aims. The scheme for S. Typhimurium developed by Felix in 1956 (England) played a big role in many outbreak investigations and the S. Enteritidis scheme from Ward [61] and Lalko/Laszlo [62] has been invaluable in the investigation of egg- and poultry-associated outbreaks that have been accomplished worldwide from the 1980s till today [7].
In 1929, White developed a typing scheme consisted on this antigenic chancing, which was afterwards changed by Kauffmann. This investigation allowed the separation of Salmonella into serovars. In 1934, the first Kauffmann-White scheme comprising 44 serovars was reported by Kauffmann and the Salmonella Subcommittee [63].
Phage typing supplies a worthful epidemiological work for greater sub-distinction of different serovars and is of exceptional importance in outbreak research. At the NRC, this method has been accomplished for serovars Enteritidis, Typhimurium and some others. Moreover, molecular techniques such as ribotyping (for S. Enteritidis) and pulsed field gel electrophoresis (PFGE) (for S. Typhimurium and others) are utilized to presumed outbreak isolates [7].
Whole of the methods; the gold standard diagnostic method for Salmonella is culture.
Culture.
The culture techniques and media that may result best in a specific diagnostic condition subject to a variety of factors, including the Salmonella serovar, type and source of specimens, practice of the microbiologist, animal species of origin, availability of selective enrichment and selective plating media. Salmonella determination by bacteriological methods generally requires 5–11 days, and samples with low numbers of Salmonella cells, generally seen in subclinically infected chickens, may give false-negative results. The increasing application of external quality assurance programmes has led to larger use of international standard methods, such as ISO 6579:2002; [64] while this has not been validated for faecal and environmental samples and was intended for foodstuffs and feeding stuffs. Latest years a standard method for determination of Salmonella from primary animal production has been developed and assessed, and an ISO method (ISO 6579:2002 Annex D) has now been accepted (ISO, 2002). The core of the standard method is pre-enrichment in buffered peptone water, enrichment on modified semi-solid Rappaport-Vassiliadis (MSRV) and isolation on xylose-lysine-deoxycholate (XLD) and an additional plate medium of choice. This method has also been demonstrated to be greatly effective for animal feed and meat products, and is simpler and less costly than the full ISO method [61].
Immunological and nucleic acid recognition methods.
Numerous alternative Salmonella detection methods have not been fully validated for faecal and environmental samples, although progress has been made [65, 66] and are more suited for analysis of human foodstuffs where inhibitors of the PCR reactions are not so problematic even though there is a role for quick methods in test and release of batches of Salmonella-free animal feedstuffs. The quick methods are generally more costly than conventional culture, but can be economically convenient for screening materials where a low prevalence of transmission is expected or where materials, such as feedstuffs, are held pending a negative test. An enrichment/IMS method associated with ELISA or PCR can identify most transmission within 24 hours but faecal and environmental samples can be problematic for quick methods. At present none of the quick methods has been proved to be acceptable for direct detection of Salmonellaso non-selective or selective enrichment stages are necessary [67]. Standardly, this introduces more actions and operator time in the detection procedure. For DNA-based methods, inhibition of the PCR reaction by components of the test sample substance, particularly in the case of faeces, is problematic and needs appropriate DNA extraction techniques and controls to determine inhibition, which may reduce the sensitivity of the test in some cases [65]. Quick isolation methodologies may also be linked with sophisticated detection systems, such as biosensors [68]. There are many variations and developments in rapid methods for Salmonella detection, but none has been shown to satisfactorily replace culture in all circumstances [60].
Salmonella enterica subspecies enterica is an interesting pathogen varying in its pathogenesis and virulence in different animal species. Some serovars have a broad host range and typically cause subclinical intestinal infections and/or acute enteritis. In contrast, host-restricted and host-specific serovars have narrower host ranges and associated infections tend to be of the more severe systemic form. By targeting the intestines and/or reproductive tracts of animals, Salmonella are disseminated between animals in high numbers concluding in maximum levels of disease and transmission. High costs are met annually by public health services and farming industries in monitoring and trying to control Salmonella. Knowledge of the pathogenesis of Salmonella infections in divergent animal species would support to discover measures to hinder the spread of these pathogens between animals. The mechanisms of pathogenicity of a S. enterica serovar have been mainly studied in rodent models of infection. However, the behaviour of these microorganisms in one particular animal species is not necessarily predictive of its behaviour in another host species. Therefore, the application of modern molecular genetics to strains of defined virulence, together with infection studies in natural target animal species will enable a more comprehensive understanding of the determinants Salmonella serovar host-specificity and of the biology of these pathogens in individual animal species.
S. Enteritidis, S. Infantis, S. Typhimurium and lots of serovars are most commonly connected with human illness. Human S. Enteritidis cases are most frequently related with the consumption of contaminated eggs and poultry meat, while S. Typhimurium cases are mostly associated with the consumption of contaminated poultry, pig and bovine meat. In animals, subclinical infections are common. Salmonella may easily spread between animals in a herd or flock without detection and animals may become intermittent or persistent carriers. All animal and human perform the below precautions to prevent from companion animals and other food-associated Salmonellosis. Clean and disinfect utensils such as food dishes, feed foods that are more likely to be free from Salmonella such as processed foods, for example, those that are tinned, packaged or bagged. If you are buying a pet ensure that it is healthy first, keep dogs away from carrion, animal faeces and prevent them from drinking suspected contaminated water as far as possible, consider any case of diarrhoea as a potential source of infection for other animals, make sure that diarrhoea is treated properly, always disinfect after cleaning up diarrhoea, consider all diarrhoeas in your pet as potentially infective, dispose of diarrhoea safely, wrapped and double polythene bagged into a bin, washed down the lavatory, burned or buried in a safe place after disinfection, disinfect the contaminated area, wash your hands after handling your pet at all times, do not allow infected pets to come into contact with young children, old people or those already ill and keep infected dogs away from food preparation area.
\n',keywords:"salmonellosis, animals, zoonosis",chapterPDFUrl:"https://cdn.intechopen.com/pdfs/58593.pdf",chapterXML:"https://mts.intechopen.com/source/xml/58593.xml",downloadPdfUrl:"/chapter/pdf-download/58593",previewPdfUrl:"/chapter/pdf-preview/58593",totalDownloads:1317,totalViews:1178,totalCrossrefCites:1,totalDimensionsCites:3,hasAltmetrics:0,dateSubmitted:"May 24th 2017",dateReviewed:"November 3rd 2017",datePrePublished:"December 20th 2017",datePublished:"July 18th 2018",dateFinished:null,readingETA:"0",abstract:"Salmonella has long been recognized as an important zoonotic pathogen of economic importance in animals and humans. The prevalent reservoir of Salmonella is the intestinal tract of a wide range of domestic and wild animals which may conclude in a diversity of foodstuffs of both animal and plant origin becoming infected with faecal organisms either directly or indirectly. In spite of mounting concerns about other pathogens in recent years, Salmonella remains among the leading causes of food-borne disease throughout the world. Lots of both domestic and wild animals are infected by Salmonella spp., mostly harboring the bacteria in their gastrointestinal tracts with no obvious signs of illness. Therefore, Salmonella are usually present in faeces excreted by healthy animals and many times pollute raw foods of animal origin through faecal contact during production and slaughter. The organism may also be transmitted through direct contact with infected animals or humans or faecal contaminated environments. Infected food handlers may also act as a source of contamination for foodstuffs. Because of increasing antibiotic resistance of organism and companion animals, animals are important source of Salmonella infection for human. The organism can be monitored and precautions should be taken regularly by new technological methods.",reviewType:"peer-reviewed",bibtexUrl:"/chapter/bibtex/58593",risUrl:"/chapter/ris/58593",book:{slug:"salmonella-a-re-emerging-pathogen"},signatures:"Serpil Kahya Demirbilek",authors:[{id:"211995",title:"Associate Prof.",name:"Serpil",middleName:null,surname:"Kahya Demirbilek",fullName:"Serpil Kahya Demirbilek",slug:"serpil-kahya-demirbilek",email:"serpilkahya@uludag.edu.tr",position:null,institution:{name:"Uludağ University",institutionURL:null,country:{name:"Turkey"}}}],sections:[{id:"sec_1",title:"1. Introduction",level:"1"},{id:"sec_2",title:"2. Infection in animals",level:"1"},{id:"sec_3",title:"3. Salmonella infections in the domestic fowl",level:"1"},{id:"sec_4",title:"4. Salmonella infection in poultry",level:"1"},{id:"sec_5",title:"5. Salmonella infections in cattle",level:"1"},{id:"sec_6",title:"6. Salmonella infections in pigs",level:"1"},{id:"sec_7",title:"7. Salmonella infections in sheep",level:"1"},{id:"sec_8",title:"8. Salmonella infections in horses",level:"1"},{id:"sec_9",title:"9. Salmonella infections in dogs and cats",level:"1"},{id:"sec_10",title:"10. Salmonella infections in exotic pets",level:"1"},{id:"sec_11",title:"11. Salmonella detection",level:"1"}],chapterReferences:[{id:"B1",body:'Sojka WJ, Wray C, Shreeve J, Benson JA. Incidence of Salmonella infections in animals in England and Wales, 1968-74. Journal of Hygiene. 1977;78:43-56. DOI: 10.1017/S0022172400055923'},{id:"B2",body:'Mastroeni P, Maskell D. Salmonella Infections, Clinical, Immunological and Molecular Aspects. 1st ed. UK: Cambridge University Press; 2006. DOI: 10.1017/CBO9780511525360.002'},{id:"B3",body:'Hennessy TW, Hedberg CW, Slutsker L, White KE, Besser-Wiek M, Moen ME, Feldman J, Coleman WW, Edmonson LM, MacDonald KL, Dsterholm MT. A national outbreak of Salmonella enteritidis infections from ice cream. New England Journal of Medicine. 1996;334:1281-1286. 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Available from: http://www.pethealthcouncil.co.uk/images/file/Pet%20Health%20Council%20-%20Salmonellosis%20-%20May%2008.pdf [Accessed: Aug 14, 2017]'},{id:"B10",body:'Kahya S, Tuğ B, Temelli S, Carlı KT, Eyigör A. Detection of Salmonella from layer flocks and typing of the isolates. The Journal of Faculty of Veterinary Medicine. 2014;20(6):939-944. DOI: 10.1501/Vetfak_0000002549'},{id:"B11",body:'Schroeder CM, Naugle AL, Schlosser WD, Hogue AT, Angulo F, Rose S, Ehe ED, Disney WT, Holt KG, Goldman DP. Estimate of illnesses from Salmonella Enteritidis in eggs, United States, 2000. Emerging Infectious Disease. 2005;11:113-115. DOI: 10.3201/eid1101.040401'},{id:"B12",body:'Patrick ME, Adcock PM, Gomez TM, Altekruse SF, Holland BH, Tauxe RV, Swerdlow DL. Salmonella Enteritidis infections, United States, 1985-1999. Emerging Infectious Disease. 2004;10:1-7. 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Prevalence of potentially pathogenic enteric organisms in clinically healthy kittens in the UK. Journal of Feline Medicine and Surgery. 2009;11:655-662. DOI: 10.1016/j.jfms.2008.12.007'},{id:"B48",body:'Spain CV, Scarlett JM, Wade SE, McDonough P. Prevalence of enteric zoonotic agents in cats less than 1 year old in Central New York State. Journal of Veterinary Internal Medicine. 2001;15:33-38. DOI: 10.1111/j.1939-1676.2001.tb02294.x'},{id:"B49",body:'Philbey AW, Brown FM, Mather HA, Coia JE, Taylor DJ. Salmonellosis in cats in the United Kingdom: 1955 to 2007. Veterinary Record. 2009;164:120-122. DOI: 10.1136/vr.164.4.120'},{id:"B50",body:'Barber DA, Bahnson PB, Isaacson R, Jones CJ, Weigel RM. Distribution of Salmonella in swine production ecosystems. Journal of Food Protection. 2002;65:1861-1868. DOI: 10.4315/0362-028X-65.12.1861'},{id:"B51",body:'Veling J, Wilpshaar H, Frankena K, Bartels C, Barkema HW. Risk factors for clinical Salmonella enterica subsp. enterica serovar Typhimurium infection on Dutch dairy farms. Preventive Veterinary Medicine. 2002;54:157-168. DOI: 10.1016/S0167-5877(02)00023-5'},{id:"B52",body:'Tauni M, Osterlund A. Outbreak of Salmonella typhimurium in cats and humans associated with infection in wild birds. Journal of Small Animal Practice. 2000;41:339-341. DOI: 10.1111/j.1748-5827.2000.tb03214.x'},{id:"B53",body:'Geue L, Loschner U. Salmonella enterica in reptiles of German and Austrian origin. Veterinary Microbiology. 2002;84:79-91. DOI: 10.1016/S0378-1135(01)00437-0'},{id:"B54",body:'Robert Koch Institut. Salmonella infection in infants and young children by contact to exotic reptiles. Epidemiologishes Bulletin 2013;9:71. Available from: https://www.rki.de/DE/Content/Infekt/EpidBull/Archiv/2013/Ausgaben/09_13.pdf?__blob=publicationFile [Accessed: Aug 24, 2017]'},{id:"B55",body:'De Jong B, Andersson Y, Ekdahl K. Effect of regulation and education on reptile-associated salmonellosis. Emerging Infectious Diseases. 2005;11:398-403. DOI: 10.3201/eid1103.040694'},{id:"B56",body:'Scheeling TF, Lightfoot D, Holz P. Prevalence of Salmonella in Australian reptiles. Journal of Wildlife Disease. 2011;47:1-11. DOI: 10.7589/0090-3558-47.1.1'},{id:"B57",body:'Arena PC, Steedman C, Warwick C. Amphibian and reptile pet markets in the EU: An investigation and Assessment. [Internet]. Available from: http://animalpublic.de/2012/05/wissenschaftler-fordern-verbot-vonterraristikborse [Accessed: Dec 15, 2012; Aug 24, 2017]'},{id:"B58",body:'Hoelzer K, Moreno Switt AI, Wiedmann M. Animal contact as a source of human non-typhoidal salmonellosis. Veterinary Research. 2011;42:34. DOI: 10.1186/1297-9716-42-34'},{id:"B59",body:'CDC. Multistate outbreak of human Salmonella Typhimurium infections associated with pet turtle exposure – United States, 2008. Morbidity and Mortality Weekly Report. 2010;59:191-196. [Accessed: Aug 24, 2017]'},{id:"B60",body:'Office International Epizootic. Salmonellosis. Terrestrial manual, Chapter: 2.9.9. 2008'},{id:"B61",body:'Ward LR, de Sa JD, Rowe B. A phage-typing scheme for Salmonella enteritidis. Epidemiology and Infection. 1987;99:291-294. DOI: 10.1017/S0950268800067765'},{id:"B62",body:'Laszlo VG, Csorian ES, Paszti J. Phage types and epidemiological significance of Salmonella enteritidis strains in Hungary between 1976 and 1983. Acta Microbiologica et Immunologica Hungarica. 1985;32:321-340'},{id:"B63",body:'Kelterborn E. Salmonella Species. First isolation, names and occurrence. Germany: S. Hirzel-Verlag, Leipzig, Karl-Marx-Stadt; 1967'},{id:"B64",body:'International Organization for Standardization (ISO). ISO 6579: Microbiology of food and animal feeding stuffs – Horizontal method for the detection of Salmonella spp. Geneva, Switzerland: International Organization for Standardization; 2002'},{id:"B65",body:'Jensen N, Hoorfar J. 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1. Introduction
Plant hormones (phytohormones) are not nutrients, but chemicals and not all plant cells respond to hormones, but those cells that do are programmed to respond at specific points in their growth cycle. The greatest effects occur at specific stages during the cell’s life, with diminished effects occurring before or after this period [1].
Plants need hormones at very specific times during plant growth and at specific locations. They also need to disengage the effects that hormones have when they are no longer needed. The production of hormones occurs very often at sites of active growth within the meristems, before the cells have fully differentiated. After production, they have sometimes moved to other parts of the plant, where they cause an immediate effect; or they can be stored in cells to be released later. Plants can also break down hormones chemically, effectively destroying them. Plant hormones frequently regulate the concentrations of other plant hormones [2, 3].
2. Importance of plant hormones
The small amounts of plant hormones promote, control, influence and develop the growth from embryo to reproductive development, also, stress tolerance and pathogen defense. According to the importance of plant hormones in this chapter will be divided into two main points: first: the effect of plant hormones on germination and growth of plants under internal or external suitable conditions, second: the effect of plant hormones on the germination and growth of plants under internal or external unsuitable environmental conditions.
2.1 The effect of plant hormones on germination and growth of plants under internal or external suitable conditions
Seed germination is attracted to the effective growth of the embryo when appropriate environmental conditions are present, leading to seed rupture and the appearance of a small plant. There are five basic steps to germination: water imbibition, enzyme activation, initiation of embryo growth, rupture of the seed coat and emergence of seedling, seedling establishment [4, 5].
In the second step stage of germination (enzyme activation), after the absorption of water through the natural openings in the casing of the seed and spread through the tissues of the seed, gibberellins which activate the formation of the hydrolytic enzymes, mainly α- amylase in the aleurone cells, which are responsible for hydrolysis of storage macro-molecules such as starch and proteins and convert them into available forms to the embryo, usage to increase in size, and raise the osmotic content of the seed, to increase water potential [6, 7].
In addition, plant hormones have an important role in plant growth not only germination such as cytokinins (CKs) which influence cell division, the formation of shoot and helping in delay tissues senescence [8, 9]. Also, the ratios of Cytokinins and auxins affect most major growth periods during a plant’s lifetime [10]. Also, Peptide hormones, control of cell division, expansion, and play crucial roles in plant growth and development [11]. Furthermore, gibberellins (Gas) strongly promote cell elongation in seedlings [12, 13]. It can also affect cell cycling in plant [14]. Meanwhile, the responses of nitric oxide (NO) are in germination, cell death [15] and regulate plant cell organelle functions (e.g. mitochondria and ATP synthesis in chloroplasts) [16].
For enhances and increases plant hormones production in the plants, many studies have proved the need to add plant hormones either directly (GA3, kinetin and cytokinins) [17, 18] or indirectly (humic substances, manures, magnetite, natural zeolites, Moringa extract and bio-fertilization) to increase or accelerate the productivity of plant hormones in the plant [19] indicated that, the presence of organic matter represented in compost which a source of hormones like substances as auxin-like activity and gibberellin-like activity. Similar results were obtained from [20]. Ref. [21] concluded that it is also possible that the production of plant hormones influences symbiotic bacteria, such as nodule N2 fixing bacteria. During the establishment of the soybean (Glycine max L.) and Bradyrhizobium japonicum N2-fixing symbiosis, the production of plant hormones can determine the bacterial population in the nodules by, for example affecting the available substrate for the use of rhizobium. The other significant and interesting view of the effects of soil bacteria on the production of plant hormones is the alteration they may reason in plant signaling pathways, resulting in the output of plant hormones from the host plant [22, 23]. Ref. [24] concluded that the magnetic treatments have the same affected for phytohormone production. Ref. [25] reported that the highest mean values of IAA, GA, and CK (12.70, 13.71, 11.06 μg/g FW), respectively were recorded with compost and zeolite mixture in comparison with control. Ref. [26] concluded that the addition of a mixture of organic fertilizers and soil amendments led to significant increment in indigenous hormones characterized in indole acetic acid (IAA), gibberellic acid (GA3), and cytokinins (CK), which led to a significant increase in morphological growth, floral characteristics and chemical composition of Oenothera biennis. In contrast [27] found that the application of HA inhibits indoleacetic acid (IAA) oxidase, thereby hindering the destruction of this plant growth hormone.
2.2 The effect of plant hormones on the germination and growth of plants under internal or external unsuitable environmental conditions
Sometimes even under favorable germination conditions (an adequate water supply, a suitable temperature and the normal composition of the atmosphere) seeds do not germinate. In this case, seeds are considered dormant. Seed dormancy is defined as an inactive phase in which the growth and development are deferred and the respiration is greatly reduced [28, 29]. Seed coat dormancy involves the mechanical restriction of the seed coat. GA releases this dormancy by increasing the embryo growth potential, and/or weakening the seed coat so the radical of the seedling can break through the seed coat. ABA affects the testa or seed coat growth characteristics, including thickness, and affects the GA-mediated embryo growth potential [5].
Hormones also can mediate endosperm dormancy: Endosperm in most seeds is composed of living tissue that can actively respond to hormones generated by the embryo. The endosperm often acts as a barrier to seed germination, playing a part in seed coat dormancy or in the germination process. Living cells respond to and also affect the ABA:GA ratio, and mediate cellular sensitivity; GA thus increases the embryo growth potential and can promote endosperm weakening. GA also affects both ABA-independent and ABA-inhibiting process within the endosperm [30]. In addition, [33] concluded that the prevented germination of some seeds of tomato [31], iris [32], and some varieties of cabbage was due to the present of inhibitors (ABA, parasorbic acid, and coumarin) which cases distributed in plants and to possess the property of inhibiting seed germination and other growth phenomena [5, 34].
Plant hormones affect seed germination and dormancy by acting on different parts of the seed such as [35] found that the inhibitors in seeds of peach were at least one of the factors controlling in germination by preventing or retarding cell division of the radical. In Lupinus angustifolius, the contents of auxins increased through the 5th day of germination and started to decrease on the 7th day. Oppositely, gibberellins contents were decreased first then increased later, so it was clear that there was inversely related between auxins and gibberellins [36]. The germination percentage and germination rate of four studied Acacias (A. saligna, A. sophorae, A. cyclopis, and A. melanoxylon) were correlated positively with endogenous promoting and negative with endogenous inhibiting substances in their cotyledons plus embryo [37].
The promotion of germination by gibberellin and cytokinins has been demonstrated in many seed species [38, 39]. Ref. [40] treated the seeds of Acacia longifolia, with GA3 at 100 and 200 ppm and found that the higher GA3 concentration (200 ppm) was more effective in increasing germination while the concentration of 500 ppm was the best in the case of Acacia catechu [41].
Ref. [42] found that fresh seed of Acacia nilotica and Acacia albida were fully germinated when soaked in a solution of GA3 at 200 ppm for 12 h. While soaking seeds of Acacia nilotica in gibberellic acid (100 or 300 ppm for 16 h) was the best [43]. Ref. [44] studied the effect of GA3 at a concentration of (50 ppm) on 16 species (four Acacia species), and found a high germination percentage for all species.
The effect of gibberellic acid and cytokinins were also recognized on the germination of other plant species seeds. Ref. [45] studied the effect of Kinetin at different concentrations on the seed germination of Acer tataricum, and found the highest germination percentage at the concentration of 500 ppm. Ref. [46] found the best germination percentage on soaking the seeds of Trifolium pratense in 50 ppm 6-benzylaminopurine (6-BAP). Ref. [47] studied the effect of Kinetin at different conc. (10, 25, 50 and 100 ppm) in the seeds of Cassia sophera, and found the highest germination percentage at 100 ppm. The treatment of freshly harvested and 1 year old seeds of soybean (Glycine max) with, 1 ppm 6-BAP increased the germination percentage from 50 to 85% in freshly harvested seeds and to 75% in the older seeds [48]. The effect of kinetin and 6-BAP on the seed germination of Vicia faba were studied, [49] found an increase in its germination percentage at the concentration of 100 ppm kinetin. While [50] found that, the highest germination percentage for faba bean (Vicia faba L.) was achieved at the concentration of 100 ppm 6-BAP. Also [37, 51] reported that the storage has an adverse effect on the hormone within the seeds of Acacia saligna, Acacia Cyclopes, Acacia nilotica and Acacia albida, which contained the lowest value of GA3, IAA and the highest content of phenols.
Plant hormones can also alleviate abiotic stress such as drought, extreme temperatures, and salinity [52, 53]. The action of these hormones in response to situations of stress can be developed through synergistic or antagonistic activities [54]. Also, [55] concluded that the plant growth regulators like ABA, JA, and ethylene are involved in the regulation of the plant response to abiotic stress. Cytokinins are also able to enhance seed germination by the alleviation of stresses such as salinity, drought, heavy metals and oxidative stress [56, 57, 58, 59]. Ref. [60] found that GA3 plays an important role in the growth and metabolism of microalgae Chlorella vulgaris exposed to heavy metal stress and its adaptation ability to a low-level polluted aquatic environment. Meanwhile, gibberellin leads to enhancement for Zea mays seedling growth and establishment under saline soil conditions by improving nutrient levels and membrane permeability [61]. Also, hormonal interactions between plant and rhizosphere bacteria can affect plant tolerance to stress. As such, the plant and bacteria can be genetically modified so that they can perform more optimally under a range of conditions, including stress [62].
The decreased cytokinin and gibberellic acid (GA3) and increased abscisic acid contents are often observed responding in plants subjected to environmental stresses [63, 64]. Exogenous application of plant growth regulators [such as cytokinin or antioxidants (ascorbic acid) [65], Moringa (Moringa oleifera) leaves extract [66, 67], humic acid (HA) [68], or seaweed extract (SE) [69] could be an alternative strategy to ameliorate, minimizing or alleviating the adverse effects of abiotic stress factors on plant growth which led to promoting plant growth and development metabolism in plants. Several studies also indicated that results on wheat [70]; and on spinach [71]. Ref. [72] reported that the foliar application of Moringa (Moringa oleifera) leaves extract MLE is proved to be the most effective PGR in reducing plant (Lagerstroemia indica L. seedlings) exposure to salinity stress.
Also, bio-fertilization has beneficial microorganisms that increasing plant hormones, which led to enhances yield, plant growth and nutrient uptake under various environmental conditions such as salinity [73, 74, 75, 76], drought and low fertility supply [77, 78, 79], especially that some endomycorrhizal fungi (Arbuscular mycorrhizal fungi) have been proven to improve drought stress; they colonize bio-trophically the root cortex and develop an extra-metrical mycelium that helps the plants to acquire mineral nutrients from the soil particularly those, which are immobile. They can under drought conditions stimulate growth-regulating substances, increase photosynthesis, improve osmotic adjustment, optimize hormonal balance and enhance water uptake [80].
Numerous studies have found also, that it can be alleviation of salt stress on peanut [81]; on pumpkin plants [82]; on Moringa peregrina plants [83] by using foliar application of nano-fertilizers. Also, [84] reported that nano Zn-Fe oxide plays a significant role importance in alleviating salt stress, oxidative damages on plant cells by activation of certain antioxidant enzymes. In addition, [85] reported that the application of nano-oxide and bio-fertilizer reduced the negative effects of salinity due to its contributed to produce hormones.
3. Conclusions
This chapter was indicated by many studies that the plant hormones, including IAA, cytokinins, ethylene, gibberellins, and brassinosteroids, can positively affect seed germination and seedling growth, for many plants as mentioned previously in the chapter, under favorable conditions. While ABA has an adverse on affect seed germination and the growth.
Also, this chapter sheds the light on the important role of soil bacteria in the production of plant hormones or as an alternative in the case of the low rate of plant hormones in the plant, which led to hence seed germination, growth, and hence crop production.
In addition, this chapter provided many studies that prove that the plant hormones very important to overcome dormancy or growth under stress condition. Also, shed the lights on the importance of the exogenous application of plant growth regulators (cytokinin or antioxidants, Moringa leaves extract, humic acid, or seaweed extract, bio- or nano fertilizers) for enhancing the productivity of plant hormones which led to increased cell growth.
Finally, it can be stated that the plant hormones are essential for cell growth, whether under normal conditions or under stress conditions.
Conflict of interest
The author declares that she does not have any conflict of interest.
\n',keywords:"plant hormones, seed germination, dormancy, cell growth, inhibition",chapterPDFUrl:"https://cdn.intechopen.com/pdfs/65617.pdf",chapterXML:"https://mts.intechopen.com/source/xml/65617.xml",downloadPdfUrl:"/chapter/pdf-download/65617",previewPdfUrl:"/chapter/pdf-preview/65617",totalDownloads:581,totalViews:0,totalCrossrefCites:1,dateSubmitted:"September 10th 2018",dateReviewed:"January 11th 2019",datePrePublished:"September 27th 2019",datePublished:"March 4th 2020",dateFinished:null,readingETA:"0",abstract:"Many factors can cause and affect cell growth in the plant such as external (environmental) and internal factors; one of the most important internal factors is plant growth hormones. Many hormones required for cell growth, such as auxins, gibberellins, brassinosteroids, ethylene, jasmonates, salicylic acid, strigolactones and cytokinins which able to accelerate or promote growth, but, some hormone-like abscisic acid has an adverse effect on growth which increases seed dormancy by inhibiting cell growth. Also, plant hormones are able to breakdowns dormancy for many plants and can alleviate abiotic stress (salinity, extreme temperatures and, drought,…) which led to enhance germination and improve growth for many plants, whether naturally occurring in the plant or by adding it to the plant in its artificially formed or in the form of bio- or nano-fertilization in order to increase the productivity and improve its efficiency under extreme conditions. Therefore, this chapter will highlight and will provide data for the positive or/and negative effect of these hormones on many plants to achieve a rapid germination method. It will also shed light on the relationship of these hormones to some enzymes to accelerate growth.",reviewType:"peer-reviewed",bibtexUrl:"/chapter/bibtex/65617",risUrl:"/chapter/ris/65617",signatures:"Amira Shawky Soliman",book:{id:"7121",title:"Cell Growth",subtitle:null,fullTitle:"Cell Growth",slug:"cell-growth",publishedDate:"March 4th 2020",bookSignature:"Biba Vikas and Michael Fasullo",coverURL:"https://cdn.intechopen.com/books/images_new/7121.jpg",licenceType:"CC BY 3.0",editedByType:"Edited by",editors:[{id:"241658",title:"Dr.",name:"Biba",middleName:null,surname:"Vikas",slug:"biba-vikas",fullName:"Biba Vikas"}],productType:{id:"1",title:"Edited Volume",chapterContentType:"chapter",authoredCaption:"Edited by"}},authors:[{id:"273877",title:"Prof.",name:"Amira",middleName:null,surname:"Soliman",fullName:"Amira Soliman",slug:"amira-soliman",email:"sitamira2000@yahoo.com",position:null,institution:null}],sections:[{id:"sec_1",title:"1. Introduction",level:"1"},{id:"sec_2",title:"2. Importance of plant hormones",level:"1"},{id:"sec_2_2",title:"2.1 The effect of plant hormones on germination and growth of plants under internal or external suitable conditions",level:"2"},{id:"sec_3_2",title:"2.2 The effect of plant hormones on the germination and growth of plants under internal or external unsuitable environmental conditions",level:"2"},{id:"sec_5",title:"3. Conclusions",level:"1"},{id:"sec_9",title:"Conflict of interest",level:"1"}],chapterReferences:[{id:"B1",body:'Swarup R, Perry P, Hagenbeek D, Van Der Straeten D, Beemster GT, Sandberg G, et al. Ethylene upregulates auxin biosynthesis in Arabidopsis seedlings to enhance inhibition of root cell elongation. The Plant Cell. 2007;19(7):2186-2196. DOI: 10.1105/tpc.107.052100'},{id:"B2",body:'Campbell N, Reec JB. Biology. 6th ed. San Francisco: Benjamin Cummings; 2002. ISBN: 978-0805366242'},{id:"B3",body:'Davies PJ. 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The effect of gibberellic acid (GA3) on growth, metal biosorption and metabolism of the green algae chlorella vulgaris (Chlorophyceae) Beijerinck exposed to cadmium and lead stress. Polish Journal of Environmental Studies. 2011;20(1):53-59'},{id:"B61",body:'Tuna AL, Kaya C, Dikilitas M, Higgs D. The combined effects of gibberellic acid and salinity on some antioxidant enzyme activities, plant growth parameters and nutritional status in maize plants. Environmental and Experimental Botany. 2008;62(1):1-9'},{id:"B62",body:'Ghanem M, Hichri I, Smigocki A, Albacete A, Fauconnier M, Diatloff E, et al. Root-targeted biotechnology to mediate hormonal signaling and improve crop stress tolerance. Plant Cell Reports. 2011;30:807-823'},{id:"B63",body:'Atanasova L, Pissarska MG, Popov GS, Georgiev GI. Growth and endogenous cytokinins of juniper shoots as affected by high metal concentrations. Biologia Plantarum. 2004;48:157'},{id:"B64",body:'Bajguz A. Brassinosteroid enhanced the level of abscisic acid in Chlorella vulgaris subjected to short-term heat stress. Journal of Plant Physiology. 2009;166:882'},{id:"B65",body:'Sadak MS, Dawood MG. Role of ascorbic acid and α tocopherol in alleviating salinity stress on flax plant (Linum usitatissimum L.). Journal of Stress Physiology & Biochemistry. 2014;10(1):93-111'},{id:"B66",body:'Rajanandh MG, Satishkumar MN, Elango K, Suresh B. Moringa oleifera Lam. a herbal medicine for hyperlipidemia: A preclinical report. Asian Pacific Journal of Tropical Disease. 2012;2:S790-S795'},{id:"B67",body:'Moussa HR, Hassan MA-E. Growth enhancers to mitigate salinity stress in Vicia faba. International Journal of Vegetable Science. 2016;22(3):243-250'},{id:"B68",body:'Rady MM, Abd El-Mageed TA, Abdurrahman HA, Mahdi AH. Humic acid application improves field performance of cotton (Gossypium barbadense L.) under saline conditions. 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Bioresource Technology. 2007;98:1489-1493'},{id:"B81",body:'Liu XM, Zhang FD, Zhang SQ , He XS, Fang R, Feng Z, et al. Effects of nano-ferric oxide on the growth and nutrients absorption of peanut. Plant Nutrition and Fertilizer Science. 2005;11:14-18'},{id:"B82",body:'Zhu H, Han J, Xiao JQ , Jin Y. Uptake, translocation and accumulation of manufactured iron oxide nanoparticles by pumpkin plants. Journal of Environmental Monitoring. 2008;10:713-717'},{id:"B83",body:'Soliman AS, El-feky SA, Darwish E. Alleviation of salt stress on Moringa peregrina using foliar application of nanofertilizers. Journal of Horticulture and Forestry. 2015;7(2):36-47'},{id:"B84",body:'Ghaffari H, Razmjoo J. Response of durum wheat to foliar application of varied sources and rates of iron fertilizers. Journal of Agricultural Science and Technology. 2015;17:321-331'},{id:"B85",body:'Babaei K, Sharifi RS, Pirzad A, Khalilzadeh R. Effects of bio fertilizer and nano Zn-Fe oxide on physiological traits, antioxidant enzymes activity and yield of wheat (Triticum aestivum L.) under salinity stress. Journal of Plant Interactions. 2017;12(1):381-389'}],footnotes:[],contributors:[{corresp:"yes",contributorFullName:"Amira Shawky Soliman",address:"sitamira2000@yahoo.com",affiliation:'
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She obtained her Ph.D. degree (Veterinary Sciences) at the University of Trás-os-Montes e Alto Douro (Portugal). For some years, Rita parted from her activity as a veterinary practitioner and teacher. After almost 32 years teaching at the University of Trás-os-Montes and Alto Douro, she recently moved to the University of Évora (Department of Veterinary Medicine), where she teaches in the field of Animal Reproduction and Clinics. Her primary research areas include the molecular markers of the endometrial cycle and the embryo–maternal interaction, including oxidative stress and the reproductive physiology and disorders of sexual development, besides the molecular determinants of male and female fertility. She often supervises students preparing their master\\'s or doctoral theses. 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We are currently in the process of collecting sponsorship. If you have any ideas or would like to help sponsor this ambitious program, we’d love to hear from you. Contact us at info@intechopen.com.
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All of our IntechOpen sponsors are in good company! The research in past IntechOpen books and chapters have been funded by:
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European Commission
\n\t
Bill and Melinda Gates Foundation
\n\t
Wellcome Trust
\n\t
National Institute of Health (NIH)
\n\t
National Science Foundation (NSF)
\n\t
National Institute of Standards and Technology (NIST)
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Research Councils United Kingdom (RCUK)
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Foundation for Science and Technology (FCT)
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Chinese Academy of Sciences
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Natural Science Foundation of China (NSFC)
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German Research Foundation (DFG)
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Max Planck Institute
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Austrian Science Fund (FWF)
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Australian Research Council (ARC)
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