All sites up and running on AIDS vaccine trials.
D016915:AIDS Vaccines; D000328:Adult; D002170:Canada; D017326:Clinical Trials, Phase III as Topic; D004311:Double-Blind Method; D006801:Humans; D008875:Middle Aged; D009426:Netherlands; D016032:Randomized Controlled Trials as Topic; D014481:United States
D016915:AIDS Vaccines