STEP trial and HIV-1 vaccines inducing T-cell responses.
Recombinant, nonreplicating, human adenovirus serotype 5-vectored vaccine, known as MRKAd5, expressing three HIV-1 clade B-derived internal proteins when used in a homologous immunization regimen, did not decrease HIV-1 infection rate nor postinfection virus load in the first Phase IIb proof-of-concept trial. However, the vaccine did not reach the limits of vaccine T-cell induction and its design can be improved both from the point of the HIV-1-derived immunogens and their delivery. Therefore...Expand abstract
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