Using the OSHA Employment Classification Scheme.
D001769:Blood; D004651:Employment / Q000145:classification; D006268:Health Facilities / Q000145:classification; D006282:Health Personnel / Q000145:classification*; D006525:Hepatitis, Viral, Human / Q000453:epidemiology / Q000517:prevention & control; D006801:Humans; D016273:Occupational Exposure / Q000145:classification / Q000517:prevention & control / Q000706:statistics & numerical data*; D012307:Risk Factors; D014481:United States / Q000453:epidemiology; D014489:United States Occupational Safety and Health Administration