## Fungal Corneal Ulcers in India **Key Point:** **Fusarium species** is the most common fungal cause of corneal ulcers (fungal keratitis) in India and other tropical/subtropical regions, accounting for approximately 40–60% of all fungal keratitis cases in published Indian series. It is closely associated with agricultural trauma from plant material. ### Epidemiology - **Geographic prevalence:** Fusarium species dominate in tropical and subtropical climates (India, Southeast Asia, Africa, Latin America) - **Risk factors:** Agricultural trauma (plant thorn, paddy husk, vegetable matter), contact lens wear (in developed countries) - **Season:** More common in monsoon and post-monsoon months due to increased spore load in soil and vegetation - **Reference:** Multiple Indian studies (Srinivasan M et al., Bharatiya Netre Vigyan; Vaddavalli PK et al.) consistently identify Fusarium as the leading isolate in fungal keratitis ### Clinical Features — Comparative Table | Feature | Fusarium | Aspergillus | Candida | |---------|----------|-------------|---------| | **Margin morphology** | Feathery, irregular | Feathery, irregular | Raised, well-demarcated | | **Hypopyon** | Common | Common | Less common | | **Hyphae on KOH** | Septate, variable width | Septate, 3–8 μm | Yeast + pseudohyphae | | **Stromal infiltration** | Deep stromal | Superficial to mid | Superficial | | **Association** | Agricultural trauma | Agricultural/soil | Immunocompromised | ### Why Fusarium Dominates in India 1. Ubiquitous in soil, decaying plant matter, and paddy fields — the primary occupational environment of Indian farmers 2. Highly virulent: produces mycotoxins (fusaric acid, trichothecenes) that damage corneal stroma 3. Thermotolerant and grows well at body temperature (37°C) 4. Spores are easily inoculated via plant thorn or vegetable matter abrasion **High-Yield:** While **Aspergillus** is the second most common cause of fungal keratitis in India, **Fusarium** consistently ranks first in large Indian multicenter studies. Aspergillus may predominate in some specific geographic pockets (e.g., South India vs. North India series), but the overall national data favors Fusarium. **Clinical Pearl:** A history of **agricultural trauma** (thorn prick, plant material) in a tropical setting with a **feathery ulcer margin**, **hypopyon**, and **septate hyphae on KOH mount** is the classic presentation of **Fusarium keratitis**. Treatment of choice is **Natamycin 5% eye drops** (the only topical antifungal with proven efficacy against Fusarium). **Mnemonic:** **FARM** — **F**usarium is the **A**gricultural **R**ural **M**ost-common fungal keratitis organism in India. [cite: Khurana AK, Comprehensive Ophthalmology, 7th ed.; Srinivasan M, Indian J Ophthalmol — Mycotic Keratitis series; Vaddavalli PK et al., Ophthalmology 2011]
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