TABLE 3.
Number of aP vaccine recipients showing positive Ab responses according to CMI status
| CMI statusa | B. pertussis antigen | No. of subjects tested | Seropositivity (%)b |
|---|---|---|---|
| Converters | PT | 13 | 1 (7.6) |
| PRN | 15 | 9 (60) | |
| FHA | 9 | 7 (77.7) | |
| Nonconverters | PT | 15 | 1 (6.6) |
| PRN | 8 | 2 (25) | |
| FHA | 13 | 5 (38) |
a
At 48 months of age; all negative at 7 months of age.
b
To the B. pertussis antigen showing CMI conversion or nonconversion. Seropositivity was defined as a value of ELISA units four times higher than the MLD, set at 2 U/ml for IgG to PT and FHA and 3 U/ml for IgG to PRN.