To present an unusual agent responsible for a case of keratitis in a female hydrogel contact lens wearer.

A 16 year old immunocompetent girl, hydrogel contact lens wearer, presented with red eye. The patient reported red eye with blurred vision and pain from the previous day. In the central cornea, two stromal lesions were found surrounded by an infiltrate. Corneal scrapings, smears, the lenses and their box as well as the cleansing solutions were sent to the bacteriology unit for analysis.

The agent isolated was Comamonas acidovorans, a species of Pseudomonas. The patient was treated with local ciprofloxacin, tobramycin and hexamidine diisetionate 0, 1% with remission of the case.

Comamonas acidovoransis a ubiquitous gram-negative rod. It is usually considered nonpathogenic. Keratitis caused by Comamonas acidovorans in immunocompetent patients has been rarely reported in the literature.

Cultures and sensitivity studies should always be performed in contact lenses wearers. Comamonas acidovorans should be considered as a possible keratitis agent in immunocompetent patients.