F2 and tetanus: Assessed one month after the third dose of the DPT-IPV vaccine, at least 92.8% of the infants in the ATP cohort in both groups achieved seroprotection antibody concentrations/titers against diphtheria, tetanus and poliovirus types 1, 2, 3 and were seropositive for both pertussis antigens, i.e. pertussis toxin (PT) and filamentous hemagglutinin (FHA) (Table 2).