Alcaligenes faecalis, Stenotrophomonas maltophilia, and Pseudomonas aeruginosa in a Mixed Microbial Contact Lens Keratitis: A Case Report

We present a case of mixed microbial keratitis in an otherwise healthy contact lens wearer. The microbes detected on microscopy included Pseudomonas aeruginosa, Acanthamoeba, Alcaligenes faecalis, and Stenotrophomonas maltophilia. P. aeruginosa and Acanthamoeba are well-recognised corneal pathogens, although S. maltophilia is uncommon, and A. faecalis is extremely rare. We were only able to find one previously reported case of A. faecalis keratitis, in a cornea that was otherwise compromised by ocular cicatricial pemphigoid. To the best of our knowledge, this case represents the second reported case of A. faecalis keratitis, and the first one in the context of a mixed microbial contact lens-related keratitis.