US Centers for Disease Control's HIV survey.
D002487:Centers for Disease Control and Prevention, U.S.; D003625:Data Collection; D015528:HIV Seroprevalence; D006801:Humans; D016273:Occupational Exposure; D009985:Orthopedics / Q000706:statistics & numerical data*; D012307:Risk Factors; D014481:United States / Q000453:epidemiology