Table 2.

Number of Cough Episodes and Laboratory-Confirmed Infections, by Hierarchic Diagnostic Laboratory Criteria and by Vaccine Received

Vaccine ReceivedTotal
DTaP SBDTaP CBDT
Cough episodes8307813421953
Laboratory-investigated (%)94%93%95%93%
Laboratory-confirmed
B pertussisinfections
138 (100%)126 (100%)127 (100%)391 (100%)
 Culture-confirmed35 (25.3%)30 (23.8%)57 (44.9%)122 (31.2%)
 Increase in antibody titers50 (36.2%)57 (45.4%)56 (44.1%)163 (41.7%)
 Single IgG PT titer53 (38.4%)39 (30.9%)14 (11.0%)106 (27.1%)