Listeria monocytogenes osteomyelitis.

Listeria monocytogenes is usually an opportunistic pathogen causing either meningitis or bacteremia in adults. Focal infection outside the central nervous system occurs infrequently. We describe two cases of osteomyelitis caused by L monocytogenes. Certain characteristics of L monocytogenes may make cure difficult, particularly in a deep-seated focus such as bone, and may warrant special consideration when planning therapy.