title: Lancefield group G streptococcus septic arthritis in a heroin user: report of a case.
mesh_terms: D000328:Adult; D001170:Arthritis, Infectious / Q000209:etiology*; D003932:Heroin; D006801:Humans; D007719:Knee Joint; D008297:Male; D013290:Streptococcal Infections; D019966:Substance-Related Disorders / Q000150:complications*
chemical_list: D003932:Heroin