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 <i>Pseudomonas aeruginosa</i>, <i>Acanthamoeba</i>, <i>Alcaligenes faecalis</i>, and <i>Stenotrophomonas maltophilia</i>. <i>P. aeruginosa</i> and <i>Acanthamoeba</i> are well-recognised corneal pathogens, although <i>S. maltophilia</i> is uncommon, and <i>A. faecalis</i> is extremely rare. We were only able to find one previously reported case of <i>A. faecalis</i> 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 <i>A. faecalis</i> keratitis, and the first one in the context of a mixed microbial contact lens-related keratitis.