Transmission of hepatitis A and hepatitis B by shared needle.
D000328:Adult; D006506:Hepatitis A / Q000209:etiology*; D006509:Hepatitis B / Q000209:etiology*; D006556:Heroin Dependence / Q000150:complications; D006801:Humans; D008297:Male; D009339:Needles / Q000009:adverse effects