Acellular pertussis vaccine effectiveness over time
OBJECTIVES: To determine pertussis risk by diphtheria-tetanus-acellular pertussis (DTaP)
vaccination status and time since last DTaP dose. METHODS: Children born at Kaiser
Permanente Northern California between 1999 and 2016 were followed from 3 months of
age until they tested positive for pertussis; disenrolled from Kaiser Permanente Northern
California; received the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis,
adsorbed vaccine; turned 11 years of age, or the end of the study period. DTaP vaccination …
vaccination status and time since last DTaP dose. METHODS: Children born at Kaiser
Permanente Northern California between 1999 and 2016 were followed from 3 months of
age until they tested positive for pertussis; disenrolled from Kaiser Permanente Northern
California; received the tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis,
adsorbed vaccine; turned 11 years of age, or the end of the study period. DTaP vaccination …