title: Efficacy trial of heat-inactivated hepatitis B vaccine (CLB) in male homosexuals in the Netherlands.
abstract: The efficacy of a heat-inactivated hepatitis B virus (HBV) vaccine, containing 3 micrograms-HBsAg, was studied among a group of 800 susceptible homosexual men. The trial was conducted randomized, placebo-controlled and double blind. At the trial end point (21.5 months) the attack-rate for all HBV infections together was 4.8% among vaccinees and 23.8% among the placebos (p less than 0.0001). Four months after the first injection 89% of the vaccinees had formed anti-HBs and this percentage declined only slightly during the follow-up period. Maximum titers were reached 5 months after the first vaccination. None of the vaccinees who responded to the vaccine with anti-HBs greater than or equal to 1 mIU/ml developed a HBsAg positive infection. The vaccine had no serious side-effects.
mesh_terms: D002986:Clinical Trials as Topic; D006510:Hepatitis B Antibodies / Q000032:analysis; D017325:Hepatitis B Vaccines; D006716:Homosexuality; D006358:Hot Temperature; D006801:Humans; D008297:Male; D009426:Netherlands; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D006510:Hepatitis B Antibodies; D017325:Hepatitis B Vaccines; D014765:Viral Vaccines