Trachoma


Continuing Education Activity

Trachoma is a bacterial infection of the eyes caused by Chlamydia trachomatis. The infection causes roughening and scarring of the inner surface of the eyelids and erosion of the corneal surface, which eventually leads to blindness. Trachoma is one of the leading causes of blindness worldwide today. This activity outlines the evaluation and management of trachoma and highlights the role of the interprofessional team in improving care for patients with this condition.

Objectives:

  • Identify the etiology and epidemiology of trachoma.
  • Outline the presentation of a patient and physical exam findings associated with trachoma.
  • Describe the treatment and management options available for trachoma.
  • Explain the importance of collaboration and communication amongst the interprofessional team to enhance the delivery of care for patients affected by trachoma.

Introduction

Trachoma is a bacterial infection of the eyes caused by Chlamydia trachomatis. The infection leads to scarring of the inner surface of the eyelids and erosion of the corneal surface, which eventually leads to blindness. Trachoma is one of the leading causes of blindness worldwide today. The bacteria are transmitted via direct or indirect contact. Contact with the affected person's eye or nose are the main ways the infection is spread. Closed living spaces and poor sanitation increase the spread of the disease.

Etiology

The causative agent of trachoma, Chlamydia trachomatis, is transmitted from infected to uninfected individuals in numerous ways: direct eye to eye spread during close contact, hand-eye contact, indirect spread on fomites, and transmission by eye-seeking flies.[1] Crowded living conditions play a major role in promoting the spread of the disease.[2] Trachoma is frequently found to cluster within endemic regions.

Epidemiology

Trachoma is considered to be the third leading cause of blindness worldwide after cataract and glaucoma.[3] Almost 8 million people are either blind or have severe visual impairment due to trachoma according to some estimates.[4] Africa, some regions of the Middle East, the Indian Subcontinent, Southeast Asia, and South America show the highest prevalence today.[5] North America and Europe showed a significant reduction in the disease prevalence due to general improvement in living standards, rather than specific interventions.[1]

Trachoma is a childhood disease, and pre-school children are most commonly affected as compared to adults.[6][7] With increasing age, however, the prevalence of scarring increases as opposed to the signs of active infection. Studies have shown that in some areas, women are more frequently affected by the disease complications than men.[8]

Pathophysiology

Trachoma is associated mainly with infection by serovars A, B, Ba, and C of Chlamydia trachomatis. Serovars D-K are conventionally associated with adult inclusion conjunctivitis. Other species of the Chlamydiaceae family, such as Chlamydophilia psittaci and Chlamydophila pneumoniae, have also been implicated. 

Trachoma infection occurs as an initial 'active' inflammatory stage, which is more common in pre-school children. This may be mild and may only result in trachomatous conjunctivitis (follicular/papillary). Intense cases are characterized by the presence of papillary hypertrophy.

Recurrent infection, however, elicits a chronic immune response. The presence of intermittent chlamydial antigens provokes this reaction. It is a cell-mediated delayed hypersensitivity (Type 4) response. This repeated insult leads to scarring and other forms of permanent damage. This is the chronic 'cicatricial' stage and most commonly occurs in middle age. Most of the scarring in this stage is prominent on the upper tarsal plate. This scar tissue contracts leading to in-turning of the lid, causing entropion, and this entropion eventually leads to trichiasis. Entropion is the most common cause of trichiasis in trachoma patients. Trichiasis, however, may also result from aberrant lashes or metaplastic lashes in rare cases. Ultimately, blinding corneal opacification can develop.

Histopathology

In children, active trachoma is common. The classic findings include a hyperplastic conjunctival epithelium, and widespread inflammatory infiltrates such as B and T lymphocytes, neutrophils, macrophages, and plasma cells.[9] A generalized increase in collagen types 1, 3, and 4 is seen on staining for collagen subtypes. Studies have also revealed the deposition of new type 5 fibers.[10] In adults with scarring, however, the conjunctival epithelium is atrophic, and goblet cells are lost.[11] A thick scar of type 5 collagen replaces the loose subepithelial stroma. These newer fibers get attached to the tarsal plate tightly. This eventually leads to distortion. Conjunctival inflammation is often observed.

History and Physical

History:

Patients with trachoma will usually present with redness of the eyes, itching and irritation of the eyes and eyelids, discharge from the eyes, swelling of the eyelids, eye pain, and photophobia. It is important to determine the duration of the symptoms. A history of travel to endemic areas (e.g., North Africa, Middle East, India) should be obtained. Concomitant vaginitis, cervicitis, or urethritis should be ruled out if the patient is sexually active.

Physical:

Active Trachoma

  1. Mixed follicular/papillary conjunctivitis. There may be some associated mucopurulent discharge.
  2. Superior epithelial keratitis is commonly seen.
  3. Corneal vascularization may lead to the development of pannus.

Cicatricial Trachoma

  1. Stellate or linear conjunctival scars, or broad confluent scars (sometimes referred to as the Arlt line) in advanced stages. Although the entire conjunctiva is involved, the effects are more prominent on the upper tarsal plate.
  2. A row of shallow depressions called Herbert pits may be formed in the superior limbus when the follicles in this region resolve.
  3. Trichiasis, distichiasis, corneal vascularization, and entropion may be seen.
  4. Severe corneal opacification can occur.
  5. Destruction of goblet cells and the ductules of the lacrimal glands eventually leads to a dry eye.

Evaluation

The diagnosis of trachoma relies chiefly on history and the clinical signs, as seen on slit-lamp examination. While many diagnostic tests have been developed to detect the organism, there exists no 'gold standard' investigation.[12][13] Some of the tests currently used are:

  • Giemsa staining of smears of conjunctival cells to demonstrate the chlamydial inclusion body.
  • Cell cultures and microscopy.
  • Enzyme-linked immunoassays to detect chlamydial antigens.
  • Nucleic acid amplification tests, such as PCR, are becoming increasingly popular. These tests, in contrast to other investigations, are highly specific as well as sensitive. However, they are not appropriate for non-research use due to expense and complexity.

Treatment / Management

The SAFE strategy recommended by WHO encompasses surgery for trichiasis, antibiotics, facial hygiene, and environmental improvement.

  • Antibiotics should be administered to the patient as well as to all the family members.
    • A single dose of azithromycin (20 mg/kg up to 1g) is the treatment of choice.
    • Erythromycin 500 mg twice daily for 14 days or doxycycline 100 mg twice daily for 10 days may be considered (use tetracyclines with caution in pregnancy/breastfeeding/children).
    • 1% tetracycline ointment may be used topically. However, it is less effective than oral treatment.
  • Facial cleanliness is important.
  • Environmental improvement, for example, proper sanitation, access to clean drinking water, and control of flies, etc.
  • Surgery may be required for relieving entropion and trichiasis and maintaining complete lid closure. 

Management of Trichiasis and Cicatricial Entropion:

Trachoma is the most common infectious cause of blindness worldwide. Conjunctival scarring with ensuing trichiasis and entropion result in corneal scarring and eventual blindness. The proper management of trichiasis and cicatricial entropion in trachoma is vital to prevent visual disability. 

Treatment of Lashes: There is a movement to teach simple procedures to ancillary medical team members in areas where this disease is endemic so that early intervention may be instituted and corneal injury and scarring prevented. 

  1. Simple epilation
  2. Destruction of eyelash follicles
    • Radiofrequency ablation of follicles
    • Cryotherapy to lash roots
    • Electrocautery
    • Laser (argon, etc.) treatment of lash roots
    • Irradiation (infrequently used now)
  3. Surgical excision of roots of eyelashes

Surgical Repair of Trichiasis and Entropion:

  1. Tarsal rotation with bilamellar tarsal rotation or anterior lamellar tarsal rotation
  2. Tarsal repositioning with tarsal advancement with or without tarsal rotation
  3. Posterior lamellar lengthening with the advancement of the posterior lamella with or without an interpositional mucous membrane or tarsal graft
  4. Surgery to the anterior lamellar and eyelid margin:
    • anterior lamellar repositioning 
    • eyelid margin split and eversion
    • anterior tarsal wedge resection (or grooving) and eversion
  5. Tarsectomy

Differential Diagnosis

  • Chronic follicular conjunctivitis
  • Parinaud oculoglandular conjunctivitis
  • Silent dacryocystitis
  • Contact lens-related problems
  • Other causes of entropion and trichiasis

Staging

The World Health Organization (WHO) recommends a simplified grading system for trachoma.[14] This is summarized below:

  • Trachomatous inflammation, follicular (TF)
  • Trachomatous inflammation, intense (TI)
  • Trachomatous scarring (TS)
  • Trachomatous trichiasis (TT)
  • Corneal opacity (CO)

Prognosis

The overall prognosis of trachoma is good. Early diagnosis and treatment is the key to minimize irreversible complications and damage to the eye. In recent years, community-based implementation of the SAFE strategy has improved the prognosis for thousands at risk. A study conducted in South Sudan showed significant reductions in the prevalence of active disease as a result of practicing this strategy.[15]

Complications

  • Conjunctival scarring
  • Entropion
  • Trichiasis
  • Distichiasis
  • Corneal vascularization
  • Severe corneal opacification
  • Dry eye
  • Superadded bacterial infection

Deterrence and Patient Education

Patient education should be centered around the avoidance of overcrowding and poor hygiene. Hand-eye contact should be kept to a bare minimum. Frequently scratching the eyes should be avoided. Practicing good hygiene, particularly regularly washing hands, should be encouraged. Infected people should immediately be quarantined from the rest of the members of the family and also friends and associates. Once the diagnosis has been made, a proper understanding of the disease nature, its means of spread, and the preventive measures should be given to the patient. Patients should also be warned regarding the possible complications owing to non-compliance to treatment or treatment failure.

Pearls and Other Issues

  • Blindness caused by trachoma is the commonest cause of blindness by infection
  • Blindness caused by trachoma is preventable
  • Simple techniques of epilation, treatment of trichiasis and simple surgical procedures should be taught to clinicians and supporting medical staff in areas where this disease is endemic

Enhancing Healthcare Team Outcomes

Trachoma is a very common infection that is often first seen by the primary care provider or the emergency department provider. These clinicians should always consult with the ophthalmologist before starting any treatment. The disease needs to be dealt with in time to avoid morbidity. Coordination among healthcare professionals is vital for better patient outcomes. Ophthalmologists, opticians, dermatologists, nurses, and pharmacists all need to work in coherence to tackle the disease and all the possible complications. Even after treatment, the patient should be closely followed until the symptoms have subsided, and the visual acuity is normal. Surgeons also need to be involved since surgical interventions may be required to avoid complications. Interprofessional communication is the key to manage the problem at its core appropriately.

An interprofessional team approach is necessary. The clinicians will decide the course of treatment and prescribe appropriate therapy. Nursing can assist in patient education about the disease, as well as assess therapeutic effectiveness and patient compliance. Pharmacists should verify dosing and perform medication reconciliation to ensure the absence of drug-drug interactions. Any concerns form nursing or pharmacy should be reported to the treating clinicians promptly. Trachoma management will be optimized by this type of interprofessional, collaborative approach, leading to better patient outcomes.



(Click Image to Enlarge)
A.	Trichiasis. The eyelid itself is not turning in but the lashes are pointing inwards.
B.	Madarosis. Short stubby lashes of different sizes indicates trichotillomania
C.	Symblepharon with secondary trichiasis, fornix shortening, cicatricial entropion
D.	Poliosis
E.	Trachoma with corneal opacification
F.	Pemphigoid disease with cicatricial entropion, trichiasis, ankyloblepharon, corneal scarring, dry eye
A. Trichiasis. The eyelid itself is not turning in but the lashes are pointing inwards. B. Madarosis. Short stubby lashes of different sizes indicates trichotillomania C. Symblepharon with secondary trichiasis, fornix shortening, cicatricial entropion D. Poliosis E. Trachoma with corneal opacification F. Pemphigoid disease with cicatricial entropion, trichiasis, ankyloblepharon, corneal scarring, dry eye
Contributed by Professor Bhupendra C. K. Patel MD, FRCS

(Click Image to Enlarge)
Bacterial conjunctivitis
Bacterial conjunctivitis
Image courtesy O.Chaigasame
Article Details

Article Author

Bilal Ahmad

Article Editor:

Bhupendra Patel

Updated:

2/25/2021 4:32:05 PM

PubMed Link:

Trachoma

References

[1]

Jones BR, The prevention of blindness from trachoma. Transactions of the ophthalmological societies of the United Kingdom. 1975 Apr;     [PubMed PMID: 775692]

[2]

Bailey R,Osmond C,Mabey DC,Whittle HC,Ward ME, Analysis of the household distribution of trachoma in a Gambian village using a Monte Carlo simulation procedure. International journal of epidemiology. 1989 Dec;     [PubMed PMID: 2621031]

[3]

Resnikoff S,Pascolini D,Etya'ale D,Kocur I,Pararajasegaram R,Pokharel GP,Mariotti SP, Global data on visual impairment in the year 2002. Bulletin of the World Health Organization. 2004 Nov;     [PubMed PMID: 15640920]

[4]

Thylefors B,Négrel AD,Pararajasegaram R,Dadzie KY, Global data on blindness. Bulletin of the World Health Organization. 1995;     [PubMed PMID: 7704921]

[5]

Polack S,Brooker S,Kuper H,Mariotti S,Mabey D,Foster A, Mapping the global distribution of trachoma. Bulletin of the World Health Organization. 2005 Dec;     [PubMed PMID: 16462983]

[6]

Dawson CR,Daghfous T,Messadi M,Hoshiwara I,Schachter J, Severe endemic trachoma in Tunisia. The British journal of ophthalmology. 1976 Apr;     [PubMed PMID: 1276112]

[7]

Dolin PJ,Faal H,Johnson GJ,Ajewole J,Mohamed AA,Lee PS, Trachoma in The Gambia. The British journal of ophthalmology. 1998 Aug;     [PubMed PMID: 9828780]

[8]

West SK,Munoz B,Turner VM,Mmbaga BB,Taylor HR, The epidemiology of trachoma in central Tanzania. International journal of epidemiology. 1991 Dec;     [PubMed PMID: 1800408]

[9]

Abu el-Asrar AM,Geboes K,Tabbara KF,al-Kharashi SA,Missotten L,Desmet V, Immunopathogenesis of conjunctival scarring in trachoma. Eye (London, England). 1998;     [PubMed PMID: 9775249]

[10]

Abu el-Asrar AM,Geboes K,al-Kharashi SA,Tabbara KF,Missotten L, Collagen content and types in trachomatous conjunctivitis. Eye (London, England). 1998;     [PubMed PMID: 9850275]

[11]

al-Rajhi AA,Hidayat A,Nasr A,al-Faran M, The histopathology and the mechanism of entropion in patients with trachoma. Ophthalmology. 1993 Sep;     [PubMed PMID: 8371914]

[12]

Schachter J,Moncada J,Dawson CR,Sheppard J,Courtright P,Said ME,Zaki S,Hafez SF,Lorincz A, Nonculture methods for diagnosing chlamydial infection in patients with trachoma: a clue to the pathogenesis of the disease? The Journal of infectious diseases. 1988 Dec;     [PubMed PMID: 3058819]

[13]

Solomon AW,Peeling RW,Foster A,Mabey DC, Diagnosis and assessment of trachoma. Clinical microbiology reviews. 2004 Oct;     [PubMed PMID: 15489358]

[14]

Thylefors B,Dawson CR,Jones BR,West SK,Taylor HR, A simple system for the assessment of trachoma and its complications. Bulletin of the World Health Organization. 1987;     [PubMed PMID: 3500800]

[15]

Ngondi J,Onsarigo A,Matthews F,Reacher M,Brayne C,Baba S,Solomon AW,Zingeser J,Emerson PM, Effect of 3 years of SAFE (surgery, antibiotics, facial cleanliness, and environmental change) strategy for trachoma control in southern Sudan: a cross-sectional study. Lancet (London, England). 2006 Aug 12;     [PubMed PMID: 16905023]