Background. Unexpected waning of immunity after pertussis vaccination is now well
described. In this study we examined whether prior vaccination with whole-cell pertussis …

Background. Despite widespread childhood vaccination against Bordetella pertussis,
disease remains prevalent. It has been suggested that acellular vaccine may be less …

OBJECTIVES: To determine pertussis risk by diphtheria-tetanus-acellular pertussis (DTaP)
vaccination status and time since last DTaP dose. METHODS: Children born at Kaiser …

Background: A resurgence of pertussis cases among both vaccinated and unvaccinated
people raises questions about vaccine effectiveness over time. Our objective was to study …

Background: Between July 1997 and April 1998, universal childhood immunization
programs in Canada changed from using a whole-cell pertussis to a 5-component acellular …

Context In 2010, California experienced its largest pertussis epidemic in more than 60 years;
a substantial burden of disease was noted in the 7-to 10-year-old age group despite high …

Background In the United States, children receive five doses of diphtheria, tetanus, and
acellular pertussis (DTaP) vaccine before 7 years of age. The duration of protection after five …

BACKGROUND: During the 1990s, the United States switched from combined diphtheria,
tetanus toxoids, whole-cell pertussis (DTwP) vaccines to combined acellular pertussis …

Background. We conducted a 5-year follow-up study on the persistence of pertussis-specific
antibody and cell-mediated immunity after booster immunization of adolescents aged 11–13 …

BACKGROUND: Pertussis incidence has been increasing for the past two decades in
Norway, as in much of the highly vaccinated world. The greatest increase is in teenagers …