A summary of the differences of adenoviral and herpetic viral conjunctivitis
\r\n\tA quark exhibits confinement, which means that the quarks are not observed independently but always in combination with other quarks. This makes determining the properties (mass, spin, and parity) impossible to measure directly; these traits must be inferred from the particles composed of them. There are six flavors of quarks: up, down, strange, charm, bottom, and top. The flavor of the quark determines its properties.
\r\n\tThere are three generations of quarks, based on pairs of weak positive/negative, weak isospin. The first generation quarks are up and down quarks, the second-generation quarks are strange and charm quarks, the third generation quarks are top and bottom quarks. The up and down quarks make up protons and neutrons, seen in the nucleus of ordinary matter. They are the lightest and most stable. The heavier quarks are produced in high-energy collisions and rapidly decay into up and down quarks.
\r\n\tThe baryons and mesons known at the time fell into symmetric families of multiplets (octuplets, decuplets) sharing two identical quantum numbers (spin and parity), but differing in an ordered way in others (mass, charge, baryon number and strangeness). The mathematical group to fit this complex situation-SU3, the symmetric, unitary group of dimension 3-was proposed independently by Gell-Mann and Ne'eman. The validity of SU3 was demonstrated by the experiment. A major prediction was that a particle (the omega-minus), an isotopic singlet with spin = 3/2, positive parity, mass of roughly 1,680 MeV, negative charge, baryon number +1, strangeness = -3, and stable to strong decay, should exist to complete the 3/2+ baryon decuplet. It was therefore a major triumph for the scheme when the omega-minus, a baryon with the precise mass, charge, and strangeness predicted, was discovered in 1964. All these facts introduced a quark idea fully into modern physics.
\r\n\r\n\tThis book will be a self-contained collection of scholarly papers targeting an audience of practicing researchers, academics, PhD students and other scientists. The contents of the book will be written by multiple authors and edited by experts in the field.
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Venkateswarlu",coverURL:"https://cdn.intechopen.com/books/images_new/371.jpg",editedByType:"Edited by",editors:[{id:"58592",title:"Dr.",name:"Arun",surname:"Shanker",slug:"arun-shanker",fullName:"Arun Shanker"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}},{type:"book",id:"878",title:"Phytochemicals",subtitle:"A Global Perspective of Their Role in Nutrition and Health",isOpenForSubmission:!1,hash:"ec77671f63975ef2d16192897deb6835",slug:"phytochemicals-a-global-perspective-of-their-role-in-nutrition-and-health",bookSignature:"Venketeshwer Rao",coverURL:"https://cdn.intechopen.com/books/images_new/878.jpg",editedByType:"Edited by",editors:[{id:"82663",title:"Dr.",name:"Venketeshwer",surname:"Rao",slug:"venketeshwer-rao",fullName:"Venketeshwer Rao"}],productType:{id:"1",chapterContentType:"chapter",authoredCaption:"Edited by"}}]},chapter:{item:{type:"chapter",id:"44041",title:"Infective Conjunctivitis – Its Pathogenesis, Management and Complications",doi:"10.5772/52462",slug:"infective-conjunctivitis-its-pathogenesis-management-and-complications",body:'The aims of this chapter are to briefly discuss infective conjunctivitis, its subtypes and its treatment. Other forms of conjunctivitis will also be considered and discussed in this chapter, namely, neonatal conjunctivitis, conjunctivitis in the immunocompromised. A comprehensive assessment of the various treatments of conjunctivitis will also be discussed.
Conjunctivitis is a term broadly used to describe an inflammation of the conjunctiva. Conjunctivitis may be split into four main aspects; bacterial, viral, allergic and irritant. Infective conjunctivitis, namely bacterial and viral will be discussed in this chapter in details.
The conjunctiva in relation to the orbit and its structures
The conjunctiva is the fine mucous membrane which covers and joins the anterior surface of the eyeball to the posterior surface of eyelid. This translucent membrane lines the white part of the eye starting at the edge of the cornea (limbus) and runs behind the eye to cover the anterior part of the sclera. It then flows, loops forward, and forms the inside surface of the eyelids. At the medial canthus the conjunctiva fold thickens, which is called the semilunar fold.
The different parts of the conjunctiva and its relation to other obit anatomy
The conjunctiva is subdivided into three parts depending on location: palpebral conjunctiva, bulbar conjunctiva and conjunctival fornix. Histologically the conjunctiva is divided into three layers.From superficial to deep these are epithelial, adenoid and fibrous. These conjunctival layers contain a wide range of structures that includes glands, melanocytes, langerhans cells, mast cells and lymphoid tissue.
The arterial blood supply to conjunctiva is made up of branches of ophthalmic artery, the anterior and posterior conjunctival arteries. These are branches of anterior ciliary arteries and palpebral arcades respectively. The venous drainage follows the arteries. Posterior conjunctival veins drain the veins of the lid and anterior conjunctival veins drain anterior ciliary vein to ophthalmic vein.
The lymphatic drainage of the conjunctiva depends on the region of the conjunctiva. Lymphatics in palpebral region drain into the lymphatics of eyelids. In bulbar conjunctiva, lymphatics from lateral side drain into the superficial preauricular lymph nodes & lymphatics from medial side drain to deep sub maxillary nodes.
The first division of the trigeminal provides nerve supply to the conjunctiva.
Before discussing the major contents of the chapter, it is necessary to briefly discuss allergic and irritant conjunctivitis.
Allergic conjunctivitis- look for follicles and papillae which are characteristic of allergic conjunctivitis
Allergic conjunctivitis is seen in two acute disorders; seasonal allergic conjunctivitis (which is prevalent in the summer months) and perennial allergic conjunctivitis (which presents intermittently) and three chronic disorders, vernal keratoconjunctivitis, atopic keratoconjunctivitis and giant papillary conjunctivitis. Allergic conjunctivitis is considered to be a type I hypersensitivity reaction. Its treatment is largely supportive, although in severe cases, topical corticosteroids may be of some benefit 1.
Irritant conjunctivitis- generalised redness around the eye and constant tearing are typical features
Irritant conjunctivitis is a form of conjunctivitis that is often bought on by an external source. The source, considered an ‘irritant’, directly affects the conjunctiva, causing an inflammatory response. Not all causes of irritant conjunctivitis are external however. Causes of irritant conjunctivitis are vast, though some of the more common causes are hair products (e.g. shampoos), smoke or fumes, chlorinated water used in swimming pools. A common non-external source is trapped eyelashes, which continually irritate the conjunctiva. Treatment of irritant conjunctivitis is thorough cleansing of the eye and removing the irritant.
Infective conjunctivitis can be caused by several bacterial and viral pathogens. Infective conjunctivitis can be further differentiated into acute infective conjunctivitis, defined as inflammation of the conjunctiva due to infection that does not last longer than 3 weeks, and chronic conjunctivitis, inflammation of the conjunctiva that lasts longer than 3 weeks.
In the developed world, acute infectious conjunctivitis is a common presentation in the primary care setting, accounting for up to 2% of consultations with the general practitioner [ 2]. Many general practitioners find it difficult to differentiate between bacterial and viral conjunctivitis. The uncertainty of the pathogenic cause of acute conjunctivitis has led to the routine practice of prescribing a broad spectrum antibiotic topically even though the pathogen has not been proved to be bacterial in nature. In the UK, approximately 3.4 million topical antibiotic prescriptions are issued every year, at a cost to the NHS of over £4.7 million [3].
A diagnosis of conjunctivitis is usually made on the basis of a clinical history and examination by the clinician. Other investigations of conjunctivitis, such as swabs and cultures of the conjunctiva are rarely performed as it often delays treatment and has very little prognostic benefit, as conjunctivitis is often a self limiting illness and the antibiotics currently used have a good spectrum of pathogen coverage. Swabs and cultures are mainly used in research purposes.
It is vital that a correct diagnosis is made to early to identify the cause and start treatment promptly. It is also essential to rule out more serious causes and medical emergencies that would require hospital admission. Such cases would include bacterial keratitis, acute closed angle glaucoma, corneal abrasions and others.
Bacterial conjunctivitis is a relatively common infection and affects all people, although a higher incidence is seen in infants, school children and the elderly. Bacterial conjunctivitis has a higher prevalence in children, where a recent study by Rose et al identified 67% of 326 children as having a bacterial cause [4]. Although its incidence is continuing to decrease in developing nations, periodic rises in incidence are seen during the monsoon seasons in many countries such as Bangladesh, and thus, bacterial conjunctivitis is the most common cause of infective conjunctivitis in developing nations.
Bacterial conjunctivitis can be broadly split into three major categories; hyperacute bacterial conjunctivitis, acute conjuncitivis and chronic conjunctivitis.
Hyperacute bacterial conjunctivitis is commonly seen in patients affected with N. Gonorrhoea. The onset is often rapid with an exaggerated form of conjunctival injection, chemosis and copious purulent discharge. Prompt treatment is essential to prevent complications.
Acute bacterial conjunctivitis is the most commonly seen bacterial conjunctivitis and often presents with a typical presentation, time course and prognosis. In a study done by Weiss et al, the most common pathogens in acute bacterial conjunctivitis were Staphylococcus aureus, Haemophilus influenzae, streptococcus pneumoniae, and Moraxella catarrhalis, whereas in an older study done by Gigilotti et al, Chlamydia trachomatis was also commonly found in infected patients [5, 6].
Chronic bacterial conjunctivitis, ie, red eye with purulent discharge persisting for longer than a few weeks, is generally caused by Chlamydia trachomatis or is associated with a nidus for infection such as in dacryocystitis [7].
In certain bacterial conjunctivitis, it is essential to identify a pathogen. As mentioned, most causes of conjunctivitis are diagnosed and treated on a clinical exam basis, but in patients who are particularly susceptible such as neonates or immunodeficient patients, a microbiological diagnosis must be made to exclude harmful pathogens such as N.gonorrheae, Listeria monocytogenes, Corynobacterium diptheriae and certain members of the Haemophilus group. These pathogens contain proteolytic enzymes which may cause long term damage to the parenchyma of the conjunctiva.
Although the symptoms of bacterial conjunctivitis are varied and quite vast, there are a number of key symptoms which differentiate it from other eye infections. Thick purulent discharge is seen as the major symptom that affects sufferers of bacterial conjunctivitis, compared to the watery discharge seen in viral conjunctivitis. This leads to ‘glue eye’ which is often the term used to describe difficulty opening the eye due to thick sticky secretions. A study done in 2004 in the Netherlands confirmed that ‘early morning glue eye’ was a positive predictor of bacterial conjunctivitis amongst 184 patients presenting with ‘glue eye’, itch or a past history of conjunctivitis [8].
Mucopurulent discharge seen in bacterial conjunctivitis
Injection of the conjunctiva and chemosis are two common symptoms and are demonstrated here
Other symptoms which are commonly seen in bacterial conjunctivitis is a ‘foreign body’ sensation, injection of the conjunctiva, chemosis (conjunctival oedema), itching, erythema of the eyelid skin and some patients also experience a slight burning or stinging sensation. In studies done by Carr et al and Wall et al almost all patients presented with injection of the conjunctiva, up to 90% of patients with bacterial conjunctivitis presented with itching and a foreign body sensation and up to 50% of patients presented with a burning or stinging sensation [9, 10]. Erythema of the eyelid was seen in 85% of patients.
Bacterial keratitis is a well known but rare complication of bacterial conjunctivitis [11]. People at particularly high risk of developing keratitis often have corneal epithelial defects or disease and patients who have particularly dry eyes are seen to be at an increased risk.
Bacterial conjunctivitis is commonly treated empirically with broad-spectrum antibiotics. Broad-spectrum antibiotics that have good efficacy against both gram-negative and gram-positive are necessary as a diverse range of pathogens can be the cause of infections. A Cochrane systematic review found that acute bacterial conjunctivitis is often a self-limiting condition, 65% (95% confidence interval of 59% to 70%) patients treated with placebo showed significant improvement occurring by the second to fifth day of infection [12]. Patients treated with topical antibiotics were shown to have improved clinical outcome, especially when treated early (days 2 to 5) with relative risk = 1.24, 95% confidence interval = 1.05 to 1.45. Patients treated late (days 7 to 10) had reduced clinical benefit with relative risk = 1.11, 95% confidence interval = 1.02 to 1.21. Microbiological remission was also improved with treatment, early (days 2 to 5) showing relative risk = 1.77, 95% confidence interval = 1.23 to 2.54 and late (days 7 to 10) relative risk = 1.56, 95% confidence interval= 1.17 to 2.09.
An open, randomized and controlled study by Everitt et al investigated 307 adults and children with suspected infective conjunctivitis using three different treatment methods: no treatment, delayed topical treatment and immediate topical chloramphenicol treatment [13]. The varying treatments did not affect the severity of symptoms experienced within the first three days of infection. However, patients with moderate symptoms who were treated immediately with topical chloramphenicol had a reduced duration of symptoms with an average of 3.3 days whilst patients that received no treatment had 4.9 days duration.
Rietveld et al carried out a double-blind randomized and placebo controlled study in a primary care setting. The efficacy of fusidic acid gel was compared to a placebo gel in 163 adult patients presenting with a red eye and mucopurulent discharge [14]. After 7 days the treatments were evaluated with clinical cure being found in 62% of patients on fusidic acid gel and 59% of patients on placebo gel. The study found that the severity of symptoms and the duration of symptoms were not significantly different in either group. In conclusion, with the limited evidence the authors produced, they did not support the current practice of prescribing empirical antibiotics.
The majority of doctors actively treat uncomplicated acute bacterial conjunctivitis with empirical topical antibiotics at diagnosis. There are several other options available including: delaying treatment for 5 days and begin treatment if no sign of improvement and to treat patients who have clinical features associated with a bacterial cause. Studies comparing the effectiveness of different antibiotics recommended for use in suspected bacterial conjunctivitis have shown similar levels of effectiveness. Therefore, it is important to consider local bacterial resistance and cost-effectiveness of the antibiotics being prescribed [15]. All antibiotic courses should be taken for 7-10 days. Compliance with the length of time the antibioticsare prescribed for is particularly important to help prevent resistance developing.
The first line treatment in mild to moderate bacterial conjunctivitis is either Trimethoprim-Polymyxin B (Polytrim) solution, Erythromycin 0.5% ointment, or Azithromycin drops. Alternatives to these antibiotics are bacitracin ointment and sulfacetamide drops. In moderate to severe infections, or antibiotic-resistant infections and in immunocompromised patients, fluoroquinolones are recommended. These include: ofloxacin, ciprofloxacin, levofloxacin, moxifloxacin and gatifloxacin. Chlamydial conjunctivitis requires oral antibiotics alongside a topical antibiotic to treat the systemic infection alongside the ophthalmic manifestation. The oral antibiotic options include Azithromycin, doxycycline, or erythromycin. These are given in combination with Azithromycin or erythromycin drops for 2 to 3 weeks [16]. In addition, patients should be advised to take several precautions to help prevent spread of infection. Patients should wash their hands regularly and thoroughly, especially after touching any infected secretions. Furthermore, patients should avoid sharing towels, pillows, or utensils.
Studies have shown that treatment with topical antibiotics shortens the duration of disease, prevents spread of infection, reduces the rate of recurrence, and decreases the risk of complications that effect vision [17].However, there has been controversy in recent years over the use of empirical antibiotics and its role in an evidently self-limiting disease with the clinical outcome being only marginally favourable to taking no antibiotics. There has been increasing antibiotic resistance especially among the older class of antibiotics that have been used extensively such as chloramphenicol, sulphonamides, polymyxins, bacitracin, aminoglycosides and early generation fluoroquinolones. The efficacy of these drugs has reduced to a combination of resistance and narrow spectrum of activity [18, 19].The newer generation of fluoroquinolones, such as gatifloxacin and moxifloxacin, have a greater range of activity and efficacy against common pathogens of the eye [20].Specifically, they have better in vitro efficacy over the older generation fluoroquinolones against gram positive pathogens. However, the efficacy was not greater with Haemophilus influenza isolates [21]. The Ocular Tracking Resistance in the U.S. Today (TRUST) initiative annually monitors the in vitro susceptibility of common ocular pathogens; Staphylococcus aureus, Streptococcus pneumonia, and Haemophilus influenzae. Between 2000 and 2005 there was a 12.1% increase in the incidence of methicillin-resistant Staphylococcus aureus (MRSA). Moreover, greater than 80% of the MRSA strains were also resistant to fluoroquinolones [22, 23].
The prognosis of bacterial conjunctivitis is normally very good with the correct and prompt treatment of the infection. In many cases, spontaneous remission, without a cure, is seen. In a study done by Sheikh and Hurwitz et al, spontaneous cure occurred in 60% of patients within 1-2 weeks [24]. However, with prompt antibiotic treatment, the treatment time is significantly reduced.
Viral conjunctivitis is a common infection amongst the Western population, and is often associated with other infections around the body. Due to the contiguity with the respiratory tract anatomy, viral upper respiratory tract infections are a common cause of secondary viral conjunctivitis.
Most cases of viral conjunctivitis are mild. Days 3-5 of infection are often the worst, but the infection will usually clear up in 7–14 days without treatment and without any long-term consequences. In some cases, viral conjunctivitis can take 2-3 weeks or more to clear up, especially if complications arise.
Much unlike bacterial conjunctivitis, there are many pathogens associated with viral conjunctivitis, although the majority of cases of viral conjunctivitis are encompassed by a few common pathogens. The specific viruses are much dependant on the geographical area in the world. In a study done in the Far East countries of Japan, Korea and Taiwan the most common pathogens isolated from 1105 cases were adenovirus 8 and enterovirus 70. Other viruses also identified were adenoviruses 19 and 37 [25]. Similarly, the causes of viral conjunctivitis in the Western countries are mainly adenoviruses, though adenovirus 13 seems to be the dominant strain in these countries.
Other rarer causes of viral conjunctivitis include herpes simplex virus, herpes zoster virus and the measles virus. Although less commonly seen, it is essential to identify herpes and measles viruses early to ensure prompt treatment, to prevent any long term complications associated with these viruses.
A recent study also showed outbreaks of the avian influenza viruses in patients, although this may possibly be linked to the recent outbreaks of the virus in humans.
As with bacterial conjunctivitis, a diagnosis of viral conjunctivitis is often made by the general practitioner on the basis of a history and examination. However, due to the overlap in symptoms between viral and bacterial conjunctivitis, it is often difficult to ascertain viral from bacterial conjunctivitis.
Classical ‘pink’ eye associated with conjunctival injection seen in viral conjunctivitis
Classical follicles seen in the conjunctiva in a patient suffering from herpetic conjunctivitis
The key symptom of viral conjunctivitis is ‘pink eye’. This shows a fine, diffuse pinkness of the conjunctiva, which is often easily mistaken for the ciliary injection of iritis. Other symptoms associated with viral conjunctivitis include discharge which is often clear and watery. This is often the most discernible difference between bacterial and viral conjunctivitis.
A history of itchy eyes is also suggestive of viral conjunctivitis, although it is a symptom also associated with irritant and allergic conjunctivitis. Rarer symptoms associated with simple adenovirus viral conjunctivitis include foreign body sensation, ocular discomfort, excessive tearing and sticky eyelids which are worse in the morning.
Herpes simplex conjunctivitis is usually unilateral. Symptoms include a red eye, photophobia, eye pain and mucoid discharge. There may be periorbital vesicles, and a conjunctival branching (dendritic) pattern of fluorescein staining makes the diagnosis.
Below is a table summarising the key differences between adenoviral and herpetic viral conjunctivitis.
\n\t\t\t\tAdenoviral\n\t\t\t | \n\t\t\t\n\t\t\t\tHerpetic\n\t\t\t | \n\t\t
Watery discharge bilaterally | \n\t\t\tUsually unilateral watery discharge | \n\t\t
Hyperaemia | \n\t\t\tDiffuse hyperaemia | \n\t\t
Petechial hemorrhages | \n\t\t\tVesicular eruptions on eyelid | \n\t\t
Punctate keratitis | \n\t\t\tFollicles | \n\t\t
Preauricular and/or submandibular lymphadenopathy | \n\t\t\tOccasional preauricularlypmphadenopathy | \n\t\t
Serous, mucoid, or mucopurulent discharge | \n\t\t\tSerous mucoid discharge | \n\t\t
Associated with pharyngitis | \n\t\t\tMajor complication of dendritic epethilial keratitis | \n\t\t
A summary of the differences of adenoviral and herpetic viral conjunctivitis
Herpes zoster Ophthalmicus is shingles of the opthalmic branch of the trigeminal nerve, which innervates the cornea and the tip of the nose. It begins with unilateral neuralgia, followed by a vesicular rash in the distribution of nerve. Once spread to the eye, it may lead to an extremely painful conjunctivitis and may take several days to settle.
There are many recognised complications of viral conjunctivitis. In many cases, it may be associated with inflammation of the cornea, known as keratoconjunctivitis. There is also an increase in likelihood of a superimposed bacterial infection. Other rare complications associated with viral conjunctivitis include blepharitis, entropion and in very rare cases, scarring of the eyelid.
Herpes simplex keratitis, demonstrated here via fluorescein staining
The most serious complication of viral conjunctivitis is herpes simplex keratitis, a corneal ulcer, which can ultimately lead to blindness. This is an extremely rare side effect of viral conjunctivitis and requires immediate transfer to hospital and review by the ophthalmologists.
Viral conjunctivitis is a self-limiting disease that usually resolves within two weeks of onset of symptoms and does not require treatment with antiviral medication. There is no evidence supporting the use of anti-viral medication and their efficacy has not been proven. However, as a highly contagious disease, there is a need to make infected patients aware of good hygiene practices to prevent further spread. Viral conjunctivitis is transmitted through direct contact, therefore, hands should be thoroughly washed regularly, and infected patients should not share pillows, towels and other utensils [26].The highly contagious nature of viral conjunctivitis, especially adenovirus, makes it necessary for infected patients to avoid going to work or school for 5 days to 2 weeks. Contagiousness of adenovirus conjunctivitis has been shown to be reduced in an in vitro study using the topical anti-viral agent povidone-iodine. Povidone-iodine at a concentration of 1:10 (0.8%) is particularly effective against free adenovirus, eradicating all of them within 10 minutes with little cytotoxicity [27]. In addition, patients with contact lenses should avoid using them until the conjunctivitis resolves and last dose of any treatment having been taken over 24 hours ago [28]. Treatment for viral conjunctivitis is supportive, involving cold compresses, ocular decongestants, and artificial tears for symptomatic relief. In patients with high susceptibility of contracting bacterial infections an antibiotic may be given to prevent a bacterial superinfection occurring.If a pseudomembrane or corneal subepithelial infiltrates develop then a topical corticosteroid may be given alongside the other non-pharmacological treatments outlined earlier. Immediate referral to an ophthalmologist should be considered in patients with a psuedomembrane or corneal subepithelial infiltrate. Immediate referral is necessary in patients with hyperacute conjunctivitis or those who have corneal involvement including ulceration and herpetic keratitis.
Viral conjunctivitis is extremely contagious and remains so for 14 days, which also is often how long the symptoms remain.
The prognosis is very good for viral conjunctivitis. It resolves completely within 2 weeks of the ‘pink eye’ onset and there are rarely any long term complications or problems associated with viral conjunctivitis [29].
Conjunctivitis in the immunocompromised is something that is often overlooked by the general practioner. However, it is essential to properly investigate conjunctivitis in immunodeficient patients as they are more likely to suffer from long term complications such as dendritic ulcers and corneal damage.
Up to 75% of HIV infected patients have suffered from conjunctivitis. Most will exhibit microvascular changes of the conjunctiva, often the inferior perilimbal bulbar conjunctiva. These changes are often seen as capillary dilations, short irregular vessels and a granular appearance of blood column within the vessels.
In some cases, there have been reports of direct infiltration of the vascular endothelial cells of the conjunctiva being infiltrated by the HIV virus, which causes a deposition of immune complexes within the conjunctiva, causing conjunctivitis.
Most conjunctivitis reports in the immunocompromised, especially HIV, have shown staphylococci to be the main infective agent, with coagulase negative staphylococci (mostly staphylococcal epidermidis the majority) accounting for most of the cases. The major other normal flora organism which cause infection in immunocompromised patients include cornybacterium pseudo/diphtherticum(found in the nasopharynx) and certain members of the Haemophilus group. Isolated cases of neisseriameningitidisand the measles virus have also been found in immunocompromised patients, although no study has yet shown a direct link between these two organisms and conjunctivitis in the immunocompromised.
Opportunistic infections may also cause conjunctivitis. Below are common pathogens that have been identified as opportunistic infections causing conjunctivitis:
Microsporidial keratoconjunctivitis- Reports of microsporidial keratoconjunctivitis in AIDS patients have been noted. This infection is caused by an intracellular protozoan parasite of the phylum Microspora. Patients affected with Microsporidial keratoconjunctivitis experience similar symptoms as with any other bacterial infection, but the symptoms of photophobia and extreme redness are also present. There may also be bilateral conjunctival hyperaemia with diffuse coarse white infiltrates, conjunctival hypertrophy and erosions of the corneal epithelium [30].
Microsporidial keratoconjunctivitis should not be overlooked in HIV patients because it rarely responds to conventional topical antivirals or antibacterials. In some cases, antiprotozoal medication has also been reported as ineffective. A recent study found that Fumagillin (Fumidin B) is the treatment with most positive outcome in HIV patients with Microsporidial keratoconjunctivitis [31].
Conjunctivitis in a patient suffering from AIDS
Molluscum contagiosum-Although rarely affecting the conjunctiva even in immunocompromised individuals, molluscum contagiosum has been noted to primarily affect the conjunctiva and also cause secondary conjunctival inflammation during infection. In one case report, a nodule of molluscum contagiosum was noted on the bulbar conjunctiva on a 34 year old man with AIDS [32]. However, in most cases of patients in an immunocompromised state with molluscum contagiosum, the conjunctiva is secondarily affected, causing an associated follicular conjunctivitis [33].
Treatment of primarily conjuctival infection of molluscum contagiosum is via cryotherapy and/or surgery, although this has shown to provide only limited long term correction in HIV patients.
Fungal infections- Fungal infections affecting the conjunctiva are rare. In immunocompromised patients, the cornea is often affected, causing a keratitis to develop. This can however, cause a secondary conjunctivitis. Studies have shown that Cryptococcus and Candida albicans are the most common pathogens affecting the cornea and conjunctiva in immunocompromised patients.
Fortunately, the treatment is very effective for fungal infections. Although hospital admission is required in patients affected with keratitis, topical amphotericin B or natamycin, subconjunctival miconazole and oral ketoconazole are proven effective antifungals.
Neonatal conjunctivitis also known as ophthalmia neonatorum is inflammation of the conjunctiva occurring in the first month of life. This condition is caused by a number of different pathogens. These include bacteria, viruses and chemical agents. In recent times prophylaxis has led to decreased morbidity in the developed world. However, it is still a significant cause of ocular morbidity, blindness and even death in the developing world.
The incidence of ophthalmia neonatorum is dependent on many different factors. The main risk factor for ophthalmia neonatorum of infective origin is the presence of a sexually transmitted disease in the mother. The organism usually infects the neonate through direct contact as it passes through the birth canal. Therefore, incidence is high in areas with high rates of sexually transmitted disease [34]. Prolonged rupture of membranes at the time of delivery is also thought to increase the risk of infection. It is also dependent on socioeconomic factors; incidence varies in highly developed countries with good prenatal care compared to the developing parts of the world [35]. The offending pathogens vary geographically due to the differences in the prevalence of maternal infection and the use of prophylaxis. In US and Europe the incidence has been reported 1-2% depending on the socioeconomic character of the area. However in other parts of the world the incidence is reported to be as high as 17%. In recent studies in Pakistanthe incidence has been 17% and in Kenya as high 23% [36, 37].
There has been a sharp decrease in the incidence of ophthalmia neonatorum in the past few decades in the developed countries due to many reasons. In 1800s, prophylaxis (silver nitrate) for ophthalmia neonatorum in the developed countries was used for the first time. Since then there has been gradual decrease in incidence. Better prenatal care has also led to detection and treatment of sexually transmitted diseases hence reduction in the risk of transmission to new-borns during birth.
Ophthalmia neonatorum can be broadly divided into two types, septic and aseptic. The aseptic type (chemical conjunctivitis) is generally secondary to the instillation of silver nitrate drops for ocular prophylaxis. Septic neonatal conjunctivitis is mainly caused by bacterial and viral infections. Causes include [38]:
From maternal genital tract:
Bacterial
Neisseria gonorrhoeae
Chlamydia trachomatis
Group B beta-haemolytic streptococci
Viral
Herpes Simplex Virus (HSV)
From cross infection:
Staphylococcus aureus
Coliforms
Pseudomonas aeruginosa
A neonate suffering from gonococcal conjunctivitis
Neisseria gonorrhoeae - Congenital gonorrhoea infection is acquired intrapartum and it leads to ophthalmia neonatorum. Gonococcal ophthalmia neonatorum presents with a severe conjunctivitis and keratitis usually in the first 48 hours of life but it can be delayed up to 3 weeks. It is frequently bilateral. If untreated, it can lead to blindness. Systemic infection can cause meningitis, arthritis and sepsis.
Chlamydia trachomatis - Also known as trachoma-inclusion conjunctivitis or TRIC.This is usually a benign, self-limiting, suppurative conjunctivitis due to Chlamydia trachomatis - serotypes D-K. Onset occurs around 1 week of age. Onset maybe earlier with premature rupture of membranes. It is characterised by mild swelling, hyperaemia and minimal to moderate discharge.
Typical presentation of a neonate suffering from herpetic conjunctivitis
Other bacteria -These bacteria make up 30-50% of all cases of neonatal conjunctivitis. The most commonly identified gram-positive organisms include Staphylococcus aureus, Streptococcus pneumoniae, Streptococcus viridans, and Staphylococcus epidermidis. Gram-negative organisms, such as Escherichia coli, Klebsiella pneumoniae, Serratia marcescens, and Proteus, Enterobacter, and Pseudomonas species, also have been implicated.
Herpes Simplex- Herpes simplex virus (HSV) can cause neonatal keratoconjunctivitis. This is a rarer form of ophthalmia neonatorum presenting in the second week of life and can be associated with a generalized herpes simplex infection.
Chemical Conjunctivitis- Classically, the most common cause of neonatal conjunctivitis is due to use of post-delivery use of ophthalmic silver nitrate used in the prophylaxis of ocular Gonococcal infections. There is a mild irritation, tearing and redness in a baby who has been administered prophylactic silver nitrate (used for the prevention of gonorrhoeal infection) within the preceding 24-48 hours. The incidence of chemical conjunctivitis in the United States has significantly decreased since replacement of silver nitrate with erythromycin ointment.
Babies present with unilateral or bilateral purulent, mucopurulent or mucoid discharge from the eyes within the first month of life. Injected conjunctiva and lid swelling may also be present. There may be associated systemic infection.
Bacterial conjunctivitis - often have a longer incubation period than for the other infective causes. Presenting with a sub-acute onset between the 4th and 28th day of life. Depending on the pathogen, there may be a mixed picture of a red eye with lid swelling and a varying amount of purulent discharge. Specific types of bacterial infection:
Chlamydial infection - 5 to 14 days after birth (some report up to 28 days after birth): unilateral/bilateral watery discharge which becomes copious and purulent later on. There may be associated preseptal cellulitis and, less commonly, rhinitis, otitis and pneumonitis.
Gonorrhoeal infection - typically 1-5 days after birth but may occur later: hyper-acute conjunctival injection and chemosis, lid oedema and severe purulent discharge. There may be associated corneal ulceration and perforation.
Viral conjunctivitis
The onset is acute usually 1-14 days after birth: unilateral/bilateral serosanguinous discharge ± vesicular skin lesions. Uncommonly it can also lead to systemic infection.
Every other potential cause of red eye needs to be excluded. The differentials include [39]:
Dacryocystitis
Congenital glaucoma
Nasolacrimal duct obstruction
Preseptal/Orbital cellulitis
Congenital glaucoma
Infectious keratitis
A definitive diagnosis of the cause of ophthalmia neonatorum is dependent on laboratory identification of the offending organism. The speed of progression of some of the causative agents makes it imperative to do a test which can identify the cause as soon as possible. Some of the laboratory tests that can be performed are as follows [40]:
Culture on chocolate agar for N gonorrhoeae. Due to the rapid progression of N gonorrhoea conjunctivitis, it makes it imperative to perform smears, as it may be possible to identify gram-negative diplococci and initiate proper treatment within hours.
Conjunctival scraping with Gram stain and Giemsa stain for chlamydia. Conjunctival specimens for chlamydia testing must include conjunctival epithelial cells because C. trachomatis is an obligate intracellular organism and exudates are not adequate for testing. Other non-culture methods such as direct fluorescent antibody testing, enzyme immunoassays and nucleic acid testing (NAT) may allow early detection of Chlamydia within hours rather than several days, as required for culture methods.
Culture on blood agar for other strains of bacteria. For other viral aetiology direct cultures of the HSV vesicles can be performed. Alternatively direct antibody testing or PCR can be done. If symptoms worsen or symptoms recur after treatment cultures may have to be repeated.
Prophylaxis- In 1881 for the first time silver nitrate was used as prophylactic treatment to reduce the incidence of ophthalmia neonatorum. Silver nitrate is specifically more effective against gonorrhoeal conjunctivitis. It inactivates gonococci by agglutination. It is not effective against Chlamydial conjunctivitis. However silver nitrate use also led to mild conjunctival inflammation, tearing and redness which typically resolved within 48 hours. Chemical conjunctivitis is a self-limiting condition, therefore no treatment is required. However preservative artificial tears have been used in some cases.
In recent times povidone-iodine drops are used as prophylaxis instead of silver nitrate [41]. These are shown to be more effective against gonococcal and chlamydial conjunctivitis and also less toxic. In US, erythromycin is being used as alternative to silver nitrate and povidone-iodine [42]. This is also well tolerated and effective against TRIC and gonococci agents.
Treatment -Treatment of neonatal conjunctivitis should initially be based on the history, clinical presentation and results of smears. This can later be adjusted when laboratory results become available then specific therapy can be instituted.
The risk of transmission of chlamydial, gonococcal, herpetic, and streptococcal pathogens to the foetus during the birth process should be considered. If necessary, cervical cultures should be performed and managed appropriately. To confirm the presence of a sexually transmitted disease in the neonate, examine and treat the mother and her sexual partner. If necessary, therapy can be modified when the results of culture and sensitivity are known.
Bacterial conjunctivitis- Chlamydial conjunctivitis is treated with fourteen day course of twice daily oral erythromycin(50 mg/kg/d divided qid) [43, 44]. Systemic therapy is important in Chlamydia conjunctivitis, due to the high incidence of extra-ocular infection in neonates. It has shown to eliminate Chlamydial infection in 80-100% of patients. Topical erythromycin can be used as adjunct with the oral therapy. If there is failure to respond to this course the fourteen day course can be repeated before seeking alternative antibiotics [45].
Gonococcal conjunctivitis may be treated with intramascular or intravenous ceftriaxone 50 mg/kg/day or as a single dose treatment of 125mg [46]. Alternatively, cefotaxime 100mg can be given intramuscularly or 25 mg/kg given either intramuscularly or intravenously every 12 hours for 7 days [47].
Neonates with conjunctivitis caused by herpetic simplex virus should be treated with systemic acyclovir to reduce the chance of a systemic infection [48]. An effective dose is 60 mg/kg/day IV divided.The recommended minimal duration is 14 days, but a course as long as 21 days may be required.Infants with neonatal HSV keratitis should receive a topical ophthalmic drug, most commonly 1% trifluridine drops or 3% vidarabine ointment.
Complications of neonatal conjunctivitis vary. There are two main types of complications, ocular and systemic complications. These can be prevented with prompt diagnosis and treatment. Ocular complications include pseudomembrane formation, peripheral pannus formation, thickened palpebral conjunctiva, cornealoedema, corneal opacification, corneal perforation, staphyloma, endophthalmitis, loss of eye, and blindness [49].
Systemic complications of chlamydia conjunctivitis include pneumonitis, otitis, and pharyngeal and rectal colonization. Pneumonia has been reported in 10-20% of infants with chlamydial conjunctivitis. Complications of gonococcal conjunctivitis and subsequent systemic involvement include arthritis, meningitis, anorectal infection, septicaemia, and death.
Ophthalmia neonatorum is a preventable cause of childhood blindness and with prompt diagnosis, treatment and efforts on all levels, this can be eradicated.
Infective conjunctivitis is a condition which affects people of all ages. Its spread is something that can be effectively controlled via good personal hygiene and adequate education. Once an individual is affected, rapid measures must be taken to ensure that the spread is limited.
Good personal hygiene is primarily achieved via effective hand washing and eye care. Where an outbreak of the highly contagious viral conjunctivitis has occurred, stringent measures to control the spread must be undertaken immediately. Simple measures such as removal of possible contaminated materials (hand cloth, towels and face cloths) are very effective in reducing spread.
For specialist cases of conjunctivitis, i.e. neonatal conjunctivitis and conjunctivitis in the immunocompromised, immediate action must be undertaken to ensure no long term complications and quick recovery. Should there be any delay in treatment, the potential for long term damage, and even blindness, is very high. Prevention of such conditions can be attained by immediate and frequent treatment via hospital admissions, prophylactic medication and good eye hygiene.
Conjunctivitis can be a very irritating and frustrating condition to suffer from. Not only does it have profound social implications, it can also affect education and finances if social exclusion is required. General practitioners must remain vigilant when diagnosing viral from bacterial conjunctivitis and try to ensure that patient education of the condition is at an optimum level to prevent spread. Special care must also be taken into consideration in neonatal conjunctivitis and conjunctivitis in the immunocompromised.
Although conjunctivitis is mostly a mild condition, GPs must also be aware of other more serious conditions and be able to differentiate mild conditions from more serious underlying and emergency conditions. This is only achieved via being able to create a list of differentials from a thorough patient history, examination and referral to an ophthalmologist if required.
One of the classical tools of Mathematics is the apparatus of Fourier series, based on the orthogonal system
Since the beginning of the last century, a huge amount of research has been carried out, devoted to the methods of effective summation of the Fourier series. Let us briefly dwell on the works to overcome this situation (for detiles see, for example, articles [2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13] and their links).
The pioneer of “overcoming the Gibbs phenomenon” is A.N.Krylov, who at the dawn of the 20th century (see [2]) proposed methods that he later developed in the monograph [3]. In particular, he proposed the following approach. Let a piecewise smooth function
In the neighborhoods of other points we assume that
where
Therefore, taking into account only first
However, the computing of the jumps
The “spectral” method proposed by Kurt Eckhoff in [4] (1993) turned out to be more practical, as it is based only on the use of coefficients
As a function
Denoting
According to Krylov’s scheme, the sequence
where the quantities
K. Eckhoff suggests to find approximate values of jumps
Further, the problem is solved by the Krylov method. It is natural to call this acceleration scheme the Krylov-Eckhoff method (KE-method). Over the past two to three decades, in the KE-method scheme, not only polynomials have been used as functions of
In [14], for a smooth function
The classical definition of the partial sums of the Fourier series is based on a gradual increase in the frequencies of the Fourier system. Below we use a more general notations from the work [17].
Definition 1. Let us call the truncated Fourier series any sum of the form
where
are Fourier coefficients of
Definition 2. Let
It is easy to see that
Definition 3. We call the system
Definition 4. Let parameters
Remark 1. The set of quasi-polynomials
For a fixed integer
Remark 2. The last product in(3)is invariant with respect to the numbering of the parameters
In the general case, the parameters
Further we denote (see [17] for details)
The system
Here we confine ourselves to the one-dimensional case. A similar universal algorithm for multivariate truncated Fourier series was proposed and numerically implemented in [1].
The following obvious formula (
where
To include the case of a quasi-polynomial
Lemma 1. If
where
Since the Bernoulli polynomial
Remark 3. Like the Bernoulli polynomials in the KE- method, quasi-polynomials
If in the sequence (9) parameters
where
Consider now the possibility of including in the consideration of some integer parameters in (10). First of all, note that if for some
If
Finally, we note that in the latter case, the sequence
Lemma 2. Let in (
If there is an
If
With a
If
The following result is a generalization of Theorem 1 in [17] to the case that in formula (15) there are integer values among the parameters
Theorem 1. Suppose the sequence(15)is given and the possible integer parameters in
where
In the main Theorem of paper [17], the phenomenon of over-convergence was theoretically substantiated. The basis of this result was the following Algorithm
Let
regarding parameters
Here we show how Algorithm
Step 1. Using the representation (9), we formally bring the left side of (18) to a common denominator, and fix the conditions
Step 2. Using the Vieta’s formula decompose the products in (18) containing the parameters
It is not difficult to see that, as a result, Eq.(18) will take the form of a linear system of equations with respect to the variables
Step 3. Solve resulting equation by the least square method.
Step 4. Again, according to the Vieta’s formulae find all roots
Step 5. Realize the approximation
Remark 4. Least square method provides only one solution in Step 3.
The following theorem is the main result of the paper [17].
Theorem 2. {The phenomenon of the over-convergence}. Let
It is now natural to formulate the following definition of the acceleration of the convergence of a truncated Fourier series.
Definition 5. Let
we define by formula (17).
Remark 5. There are no Fourier coefficients
Consider the Fourier transform
The method of the item 2 can be applied by linear change of variable to function
On the other hand, our method allows one to approximate function
Our idea is as follows. First, based on the required 1 error, you can leave a fnite number of intervals. Second, on the remaining intervals, the integrals are calculated explicitly. Really, each function
On the complex plane
Remark 6. Depending on function
Let us turn to the main details of the algorithm for such a numerical implementation of the Fourier transform for a piecewise smooth function
To make our approach understandable to a wide range of specialists, when developing an applied algorithm, we will assume that (see formulas (7–19)) for a fixed
Consider now the following when writing code to implement the one-dimensional Fourier transform.
The computer used must be installed with programs that can perform symbolic mathematical operations as well as numerical integration (for example, as system Wolfram Mathematica, see [19]). It is desirable to use the highest possible accuracy of calculations.
The singularities of piecewise-smooth function
The computer errs or freezes most often due to type
For example, let in the process of computer operation at the output of Algorithm
During the operation of the proposed algorithm for Fourier transform, \t
Let us explain the details on the following example of an approximate finding of the Fourier transform (see notation (21)).
Our goal is to provide a final value of a
and when deleting these semi-infinite intervals, further actions should lead to an error no greater than
On the other hand, we see that function
Monitoring showed (see item 4) that
The total
These calculations were performed using system Wolfram Mathematica 9.
Those who have mastered the technique of using Algorithm
There are good prerequisites for other classical (in a broad sense) Fourier tools for efficient applications based on the method of item 2 (see articles [14, 15]).
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