title: Hepatitis B virus.
mesh_terms: D002487:Centers for Disease Control and Prevention, U.S.; D002985:Clinical Protocols; D015658:HIV Infections / Q000517:prevention & control*; D006509:Hepatitis B / Q000517:prevention & control*; D006801:Humans; D016273:Occupational Exposure; D009786:Occupational Health Services; D014481:United States