At the same time a sibling had serologically confirmed pertussis.
No pertussis cases were notified in the period 1997-2002, although 10 cases were notified in 2003.
Indeed, the finding of widespread circulation of pertussis in the various populations has several explanations.
Accordingly, children with pertussis might be admitted less frequently to hospitals in countries with low vaccine coverage.
The changing epidemiology of pertussis in young infants : the role of adults as reservoirs of infection.
Introduction of whole-cell pertussis vaccine in the 1940s led to a sharp decline in the incidence of the disease in the developed world.
We see two possible explanations for the sudden increase of pertussis in vaccinated children.
In addition, we suggest conducting field studies for the active diagnosis of pertussis in adolescents and adults.
