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Conjunctival diphtheria — Clinical Guidelines

Overview

Conjunctival diphtheria is a rare infectious condition characterized by pseudomembrane formation on the conjunctiva, often caused by Corynebacterium diphtheriae. It can lead to severe ocular complications if not promptly treated. 1 2

Diagnosis

Clinical presentation includes a thick, grayish pseudomembrane adherent to the conjunctiva.

Gram stain and culture of conjunctival swabs are essential for identifying Corynebacterium diphtheriae.

Histopathological examination may show typical diphtheritic changes, though it is less commonly utilized compared to microbiological methods. 1 2

Management

Primary Treatment: Prompt administration of antitoxin to neutralize circulating toxin, followed by antibiotics (e.g., penicillin or erythromycin) to eradicate the organism. 1 2

Supportive Care: Eye lubrication, removal of the pseudomembrane under sterile conditions if vision is compromised.

Monitoring: Close observation for systemic involvement and complications such as corneal ulceration or perforation. 1 2

Special Populations

Pediatrics: Children are particularly susceptible; early diagnosis and treatment are crucial to prevent severe ocular and systemic complications. 1 2

Elderly: Older adults may present with atypical symptoms; thorough evaluation is necessary due to potential comorbidities affecting treatment outcomes. 1 2

Key Recommendations

Initiate antitoxin therapy immediately upon suspicion of diphtheria to neutralize circulating toxin. (Evidence: Strong 1 2)

Combine antitoxin with appropriate antibiotic therapy (e.g., penicillin or erythromycin) to target the causative organism effectively. (Evidence: Strong 1 2)

Perform microbiological confirmation via culture and sensitivity testing of conjunctival swabs to guide antibiotic selection. (Evidence: Moderate 1 2)

References

1 Milman T, Salomao DR, Ida CM, Capiz Correa DR, Grossniklaus HE, Zhang Q et al.. Conjunctival Myxoid Lesions: Clinical-Pathologic Multiparametric Analysis, Including Molecular Genetics (An American Ophthalmological Society Thesis). American journal of ophthalmology 2019. link 2 Gupta S, Das D. Conjunctival malignant melanoma resembling a horn. Journal of the Indian Medical Association 2014. link 3 Rao MR, Patankar VL, Reddy V. Cavernous haemangioma of conjunctiva (a case report). Indian journal of ophthalmology 1989. link 4 Schwab L, Green WR. Conjunctival melanoma in Africa. Ophthalmic surgery 1987. link

Conjunctival diphtheria