Table 3.

DTaP and DTP Vaccine Efficacy Based Upon Laboratory Confirmed B pertussis Infection* Presented by Duration of Cough With and Without Paroxysms, Whoop or Posttussive Vomiting (PWV)

Percent Efficacy (95% CI)
Duration of Cough; DaysWith or Without PWVWith PWV
DTaPDTPDTaPDTP
≥7 72 (62 –79)83 (76 –88)81 (73 –86)92 (87 –95)
≥1474 (65 –81)85 (78 –89)81 (74 –87)92 (87 –95)
≥2177 (69 –84)87 (81 –91)83 (76 –88)93 (86 –96)
≥2879 (70 –85)88 (82 –92)84 (76 –89)93 (89–96)
≥3581 (72 –87)89 (83 –93)86 (78 –91)94 (89 –97)
≥4283 (73 –89)90 (83 –94)86 (78 –91)94 (88 –97)
≥4982 (71 –89)92 (85 –96)85 (74 –91)94 (88 –97)
  • * Isolation of B pertussis by culture or significant ELISA antibody rise to PT or a household contact to a B pertussis culture confirmed case.