Septic arthritis and other infections of rheumatologic significance.

Bacterial arthritis has been reported rarely in patients with human immunodeficiency virus infection and generally is associated with other risk factors such as intravenous drug use. Septic arthritis may be caused by opportunistic organisms and may be more common in hemophiliacs when associated with human immunodeficiency virus infection. Pyomyositis and osteomyelitis have also been reported more commonly.