title: A hepatitis B vaccine.
mesh_terms: D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D006509:Hepatitis B / Q000517:prevention & control*; D006515:Hepatitis B virus / Q000276:immunology; D006801:Humans; D008297:Male; D011897:Random Allocation; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D014765:Viral Vaccines