Safety and immunogenicity of a high-titered canarypox vaccine in combination with rgp120 in a diverse population of HIV-1-uninfected adults: AIDS vaccine evaluation group protocol 022A

Academic Article


  • To test the safety and immunogenicity of a high-titered preparation of ALVAC-HIV vCP205 in both high-risk and low-risk persons and to evaluate variations in dosing schedule, we conducted a multicenter, randomized, double-blind trial of this vector in combination with recombinant subunit gp120 in 150 HIV-1-seronegative volunteers. The high-titered ALVAC vaccine was well tolerated; adverse events were minimal and not influenced by dosing. At day 728, the cumulative probability of a cytotoxic T-lymphocyte (CTL) response was 76% (95% confidence interval [CI]: 64%-89%) among volunteers receiving vaccine, and the net amount attributable to vaccination was 50% (CI: 16%; 74%). The net probability of a repeated positive CTL response by day 728 was 50% (CI: 21%; 64%). There was a significant difference in CTL response at day 182 between volunteers who had received four doses versus three doses of vCP205 (42% vs. 24%, p = .052). The CTL response was similar in high-risk volunteers and vaccinia-naive volunteers compared with vacciniaimmune volunteers. Neutralizing antibody responses were detected in 95% of vaccinees at day 287, with higher geometric mean titers in recipients of sequential versus simultaneous dosing of the two vaccines and in vaccinia-naive volunteers. This high-titered preparation of ALVAC-HIV vCP205 in combination with gp120 was safe and immunogenic in a diverse group of HIV-1-seronegative volunteers.
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    Author List

  • Gupta K; Hudgens M; Corey L; McElrath MJ; Weinhold K; Montefiori DC; Gorse GJ; Frey SE; Keefer MC; Evans TG
  • Start Page

  • 254
  • End Page

  • 261
  • Volume

  • 29
  • Issue

  • 3