Group B streptococcal polyarthritis complicating hemophilia B.

We report a case of polyarticular group B streptococcal infection in an HIV-negative 46-year-old alcoholic with factor IX deficiency. Septic arthritis occurs infrequently in the hemophilic population despite their chronic joint disease; indications for diagnostic arthrocentesis in these individuals are discussed. The group B streptococcus often behaves as an opportunist in adults.