Different hepatitis B vaccines.
D006509:Hepatitis B / Q000276:immunology; D006515:Hepatitis B virus / Q000276:immunology*; D006716:Homosexuality; D006801:Humans; D007110:Immunity, Active; D007116:Immunization, Passive; D008297:Male; D014765:Viral Vaccines / Q000627:therapeutic use*
D014765:Viral Vaccines