Young children who receive vaccinations against whopping cough are not fully protected against the disease three to six years after their shots, a new study suggests.
Currently, kids receive five doses of the pertussis vaccine, with the final injection given between ages four and six. A pertussis booster shot is recommended for adolescents.
In the new study, a small number of vaccinated kids developed pertussis anyway — and the number of pertussis cases progressively increased each year following the kids’ final vaccination. Children were seven times more likely to develop pertussis six years after vaccination than one year after vaccination.