Table 3.

Number of Laboratory-Confirmed B pertussis Infections in Children Aged 3 to 6 Years by Duration and Type of Cough and by Vaccine Received

Cough and DurationVaccine ReceivedTotal
DTaP SBDTaP CBDT
Any cough ≥7 d138 (100%)126 (100%)127 (100%)391 (100%)
Spasmodic cough ≥14 d or any cough ≥21 d115 (83%)103 (82%)117 (92%)335 (86%)
Spasmodic cough ≥21 d33 (24%)33 (26%)54 (43%)120 (31%)