Corynebacterium aquaticum urinary tract infection in a neonate, and concepts regarding the role of the organism as a neonatal pathogen.

Corynebacterium aquaticum urinary tract infection developed in a neonate 8 days after uncomplicated vaginal delivery. Prior to definitive identification, the isolate was thought to be Listeria monocytogenes because of its microscopic morphology, catalase positivity, and tumbling motility. The infant responded to intravenous ceftriaxone. Because the presentation of C. aquaticum in this patient suggested systemic involvement, C. aquaticum may be regarded as a bona fide neonatal pathogen.