Group B streptococcal vertebral osteomyelitis in an adult.

Group B beta-hemolytic streptococcus (Streptococcus agalactiae) vertebral osteomyelitis was diagnosed in a 65-year-old man. The patient received a 3-week course of in-hospital intravenous ampicillin followed by ceftriaxone and continued to receive ceftriaxone therapy on an ambulatory basis for 3 more weeks. Hospitalization and follow-up were uncomplicated with no neurological sequelae. Review of the medical literature documented only 15 cases of group B streptococcal osteomyelitis in adults and only three cases of vertebral osteomyelitis due to this pathogen. As in most adult patients with group B streptococcal infections, the patient had coexisting chronic conditions (chronic obstructive lung disease, diabetes mellitus) but bacteremia was not present. Although uncommon, group B streptococcus should be considered as an opportunistic pathogen in patients with debilitating conditions, but vertebral osteomyelitis is even rarer.