Table 1 Rates of HIV-1 infections in the vaccinees and in placebo inoculated volunteers enrolled in the STEP vaccine trial.
|  | No immunity to Ad5 (< 18 units) | Medium immunity to Ad5 (18–200 units) | High immunity to Ad5 (201–1000 units) | Very high immunity to Ad5 (> 1000 units) |
|---|---|---|---|---|
Vaccinea | 20 infected out of 382 total | 8 infected out of 140 total | 14 infected out of 229 total | 7 infected out of 163 total |
Placebob | 20 infected out of 394 total | 4 infected out of 142 total | 7 infected out of 229 total | 2 infected out of 157 total |