Protecting policemen against hepatitis B.
D006509:Hepatitis B / Q000517:prevention & control*; D006801:Humans; D009784:Occupational Diseases / Q000517:prevention & control*; D012926:Social Control, Formal; D006113:United Kingdom; D014761:Viral Hepatitis Vaccines / Q000627:therapeutic use*
D014761:Viral Hepatitis Vaccines