Overview
Mycobacterial keratitis involves infection of the cornea by mycobacteria, often nontuberculous mycobacteria (NTM), leading to potentially severe ocular morbidity if not promptly diagnosed and treated 1.Diagnosis
Clinical Presentation: Corneal ulcer with characteristic infiltrates, often unresponsive to initial antibiotic therapy 1.
Microbiological Testing: Culture of corneal scrapings is essential; PCR may aid in rapid diagnosis 1.
Risk Factor Assessment: Evaluate for underlying conditions such as contact lens use, trauma, or immunosuppression 1.Management
First-Line Treatment: Initial empirical therapy with fortified antibiotics (e.g., fluoroquinolones, aminoglycosides) followed by targeted therapy based on culture results 1.
Adjunctive Therapies: Topical corticosteroids cautiously used in conjunction with antibiotics to reduce inflammation, under strict monitoring to avoid exacerbation 1.
Duration: Treatment duration typically ranges from several weeks to months, depending on clinical response and microbiological clearance 1.Special Populations
Immunocompromised Patients: Higher risk of complications; close monitoring and potentially longer treatment durations are advised 1.
Contact Lens Users: Increased risk; emphasize proper hygiene and consider temporary cessation of lens wear during treatment 1.Key Recommendations
Consider NTM Testing in Patients with Corneal Ulcers unresponsive to initial antibiotic therapy, especially those with risk factors like contact lens use or trauma (Evidence: Moderate 1).
Rigorous Microbiological Confirmation through corneal culture is crucial for guiding targeted therapy (Evidence: Strong 1).
Monitor Closely in Immunosuppressed Individuals due to increased risk of complications and treatment failure (Evidence: Moderate 1).References
1 Loebinger MR, Quint JK, van der Laan R, Obradovic M, Chawla R, Kishore A et al.. Risk Factors for Nontuberculous Mycobacterial Pulmonary Disease: A Systematic Literature Review and Meta-Analysis. Chest 2023. link
2 Oh J, Park HD, Kim SY, Koh WJ, Lee SY. Assessment of Vitamin Status in Patients with Nontuberculous Mycobacterial Pulmonary Disease: Potential Role of Vitamin A as a Risk Factor. Nutrients 2019. link