A 22-year-old sustains a penetrating ocular injury with a soil-contaminated stick. He presents within 12 hours with a corneal laceration. Intravenous antibiotic prophylaxis is started. Which organism is of particular concern in post-traumatic endophthalmitis in this setting?
- A Bacillus cereus ✓
- B Staphylococcus epidermidis
- C Candida albicans
- D Propionibacterium acnes
Correct answer: A. Bacillus cereus
Explanation
Post-traumatic endophthalmitis from soil-contaminated penetrating injuries is classically associated with Bacillus cereus, which causes a fulminant infection with ring corneal abscess and rapid visual loss. Prophylactic intravitreal vancomycin plus ceftazidime (or systemic moxifloxacin) is considered. Staphylococcus epidermidis and Propionibacterium acnes are typical of post-cataract endophthalmitis.
Reference: AAO BCSC Section 9: Uveitis and Ocular Inflammation, 2023-2024 ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
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