A 35-year-old farmer from rural Maharashtra presents with a 2-week history of corneal ulcer following a minor corneal abrasion from a plant thorn. Examination reveals a central, round ulcer with feathery margins and a hypopyon. KOH mount of corneal scrapings shows septate hyphae. What is the most common fungal organism causing corneal ulcers in India?
A. Aspergillus fumigatus
B. Cryptococcus neoformans
C. Candida albicans
D. Fusarium species
Explanation
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
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
Thermotolerant and grows well at body temperature (37°C)
4.
Spores are easily inoculated via plant thorn or vegetable matter abrasion
High-YieldNEET PG
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 — Fusarium is the Agricultural Rural Most-common fungal keratitis organism in India.
Khurana AK, Comprehensive Ophthalmology, 7th ed.; Srinivasan M, Indian J Ophthalmol — Mycotic Keratitis series; Vaddavalli PK et al., Ophthalmology 2011
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