25-year-old female contact lens wearer presented with a painful,
red left eye of 2 day duration. Visual acuity was 6/24, the cornea
showed an ulcer measuring 1.1cm. There was hypopyon in the
anterior chamber. She was treated with intensive topical cefuroxime
and gentamicin. Bacterial culture of the ulcer was negative. A corneal
biopsy is as shown below.
1. What is the most common pathogen
isolated from the corneal ulcer
3. Name two risk factors for this infection
apart from contact lens wear.
5. Which culture medium can be used
to isolated the pathogen shown
in the picture?