TABLE 1.
Demographic parameters, CD4+ T-lymphocyte counts, and stage of HIV infection of study participants
| Group | No. of subjects | Median (range) age (yrs) | No. of males/no. of females | Median (range) CD4+ countsa (no. of cells/liter [106]) | No. of subjects with the following
CDC stageb:
|
History of tetanus vaccinationc | ||
|---|---|---|---|---|---|---|---|---|
| A | B | C | ||||||
| HIV infected with CD4+ T-lymphocyte counts of: | ||||||||
| <200 × 106/liter (group I) | 13 | 37 (22–60) | 12/1 | 40 (10–135)d | 0 | 0 | 13 | 7.6 (1–29) |
| ≥200 × 106/liter (group II) | 11 | 40 (22–59) | 10/1 | 510 (205–805) | 7 | 1 | 3 | 7.7 (1–25) |
| Controls | 5 | 36 (34–43) | 3/2 | Not done | 8 (1–23) | |||
a
Normal range of absolute CD4+ counts, 560 × 106 to 1,550 × 106/liter.
b
CDC stage, Centers for Disease Control and Prevention stage of HIV infection (3).
c
Mean (range) number of years since last tetanus toxoid vaccination.
d
Nine individuals in group I had CD4+ counts of ≤40 × 106/liter; the remaining four individuals in this group had CD4+ counts in the range of 100 × 106 to 135 × 106/liter.