| True-immunized | Mock-immunized | Infectivity controls | |
---|---|---|---|---|
1999–2000 | 2001–2002 | |||
Gender | ||||
 Male | 5 | 12 | 11 | 4 |
 Female | 0 | 0 | 2 | 1 |
Total | 5 | 12 | 13 | 5 |
Age (mean + SD) | 42 ± 10 | 34 ± 8 | 34 ± 7 | 36 ± 8 |
Race/ethnicity | ||||
 African–American | 0 | 3 | 1 | 2 |
 Caucasian | 5 | 8 | 7 | 2 |
 Hispanic | 0 | 0 | 0 | 0 |
 Not known | 0 | 1 | 5 | 1 |
Total: true-immunized | Â | 17 | Â | Â |
Total: mock-immunized | Â | 13 | ||
Total: infectivity controls | Â | 5 |