title: Some observations on the epidemiology and transmission of hepatitis B.
mesh_terms: D002353:Carrier State; D006509:Hepatitis B / Q000276:immunology / Q000635:transmission*; D006511:Hepatitis B Antigens / Q000032:analysis; D006716:Homosexuality; D006801:Humans; D008297:Male; D012749:Sexually Transmitted Diseases / Q000635:transmission; D019966:Substance-Related Disorders
chemical_list: D006511:Hepatitis B Antigens