Trends in Pertussis among infants in the United States, 1980 - 1999
Reported cases of pertussis among adolescents and adults have increased since the 1980's, despite increasingly high rates of vaccination among infants and children. However, severe pertussis morbidity and mortality occur primarily among infants.
Reemergence of Pertussis in the highly vaccinated population of the Netherlands: observations on surveillance data.
"The increase in pertussis incidence was higher among vaccinated than among unvaccinated persons of all ages. This resulted in lower estimates of vaccine effectiveness."
