Corneal ulcer due to Listeria monocytogenes.

We present a patient with a corneal ulcer due to Listeria monocytogenes, which has not previously been considered to be a feature of human listeriosis. The ulcer responded to topical and subconjunctival gentamicin and cephaloridine. Subsequent management was complicated by the development of a fibrinous pupillary membrane leading to pupillary block requiring iridotomy and later vitrectomy with trabeculectomy. Listeria monocytogenes may be confused with diphtheroid contaminants seen in corneal ulcer scrapings and is probably underreported as a cause for microbial keratitis.