Massilia timonae as cause of chronic endophthalmitis following cataract surgery

This is the first report of chronic postoperative endophthalmitis caused by Massilia timonae. The gram-negative bacillus was isolated from a patient who developed chronic endophthalmitis after cataract extraction. The microorganism was cultured on brain heart infusion broth and identified using the 16S rRNA sequence analysis. Biochemically, the organism was positive for catalase and oxidase and negative for arginine dihydrolase. It was pansensitive to beta-lactams, fluoroquinolones, aminoglycosides, and trimethoprim sulfamethoxazole but resistant to aztreonam. Massilia timonae is a new bacterium implicated in postoperative chronic endophthalmitis. Eubacterial polymerase chain reaction was useful in identifying M timonae because phenotyping testing and conventional algorithms could not identify it. (C) 2015 ASCRS and ESCRS