Conjunctivitis with regional lymphadenopathy in a trainee microbiologist

Area of Science:

• Ophthalmology
• Microbiology
• Infectious Diseases

Background:

• Tuberculosis (TB) is a significant global health concern.
• Ocular manifestations of TB are rare but can occur.
• Direct inoculation is a potential, though uncommon, route of TB transmission.

Observation:

• A trainee microbiologist developed conjunctival tuberculosis.
• The infection was suspected to be acquired through direct inoculation during laboratory work.
• The specific strain of Mycobacterium tuberculosis was isolated from the patient's conjunctiva.

Findings:

• DNA fingerprinting analysis revealed an identical genetic pattern between the conjunctival isolate and a sputum sample from the same individual.
• This strongly suggests the patient's own resident strain, present in sputum, was the source of the conjunctival infection via direct inoculation.
• The patient received standard anti-tuberculosis treatment.

Implications:

• This case highlights the risk of occupational exposure to Mycobacterium tuberculosis in laboratory settings.
• It underscores the importance of stringent biosafety protocols when handling potentially infectious samples, such as sputum.
• Successful treatment of conjunctival tuberculosis is achievable with appropriate anti-TB therapy.