TABLE 1.

Mean logarithmic titers to pertussis toxin for different study groups, as determined by three different assays

AssayStudy group
PrevaccinePostvaccineConvalescent
IgG-ELISA0.51 ± 0.031.75 ± 0.08a
CHO neutralization1.94 ± 0.203.85 ± 0.11a4.04 ± 0.11
PBMC neutralization1.34 ± 0.041.47 ± 0.03a1.68 ± 0.03b
  • a Postvaccination titers significantly greater than prevaccination titers (P < 0.05).

  • b Convalescent titers significantly greater than postvaccination titers (P < 0.05).