Group C streptococcal osteomyelitis.

A case of hematogenous osteomyelitis due to a group C Streptococcus (Streptococcus equisimilis) is presented because of the unusual nature of the infecting organism. Group C streptococci are common pathogens in animals but are infrequent causes of human infections. Of therapeutic concern is the observation that these isolates are frequently penicillin-tolerant. For this reason, it is important to speciate beta-hemolytic streptococcal isolates and to perform antimicrobial susceptibility studies.