Figure 4. Protective efficacy of the Ad/Env HIV-1 vaccine against repetitive, intrarectal SHIV-SF162P3 challenges.
(A) Number of challenges required for acquisition of infection in each vaccine group. (B) Statistical analyses include the hazard ratio with 95% confidence interval and the per exposure reduction of acquisition risk in each group, with P-values reflecting Cox proportional hazard models and log-rank tests. Additional statistical analyses include the percentage of completely protected animals at the end of the challenge series, with P-values reflecting chi-square tests and Fisher’s exact tests.