Healthy Clinical Trial
Official title:
A Randomized, Parallel-group, Placebo-controlled, Double-blind Phase 1/2a Study in Healthy HIV Uninfected Adults to Assess Safety/Tolerability and Immunogenicity of 2 Different Prime/Boost Regimens: Priming With Tetravalent Ad26.Mos4.HIV and Boosting With Tetravalent Ad26.Mos4.HIV and Either Clade C gp140 Plus Adjuvant OR a Combination of Mosaic and Clade C gp140 Plus Adjuvant
The primary purpose of this study is to assess safety/tolerability of the different vaccine regimens and of a late boost vaccination; and to assess envelope (Env)-binding antibody (Ab) responses of the 2 different vaccine regimens.
This is a randomized (study medication assigned by chance), double-blind (neither physician nor participant knows the treatment received), placebo-controlled (placebo is an inactive substance that is compared with a drug to test whether the drug has a real effect in a clinical trial), parallel-group (each treatment group will be treated at the same time), multicenter (more than one clinical site) study in healthy human immunodeficiency virus (HIV)-uninfected adults. The main study will be conducted in 3 phases: a 6-week screening period; a 48-week vaccination period; and a follow-up period to the final main study visit at Week 72. A Long-term Extension (LTE) phase (approximately 3 years after Week 72) will be performed for participants randomized to Group 1 or Group 2, who receive all 4 vaccinations and are negative for HIV infection at Week 72. The approximate duration of the study will be approximately 78 weeks for participants not participating in the LTE phase and approximately 222 weeks for participants participating in the LTE phase but not receiving a late boost vaccination and approximately 246 (12-month follow-up) or 294 (24-month follow-up) weeks for participants receiving a late boost vaccination. Participants safety will be monitored throughout the study. ;
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