More than four out of five confirmed whooping cough (pertussis) cases strike children who are fully vaccinated, a new study warns, underscoring the need for children to stay up to date on their shots.
vaccineUp to age 7, kids have a five times higher whooping cough risk when they're three years out from their last shot, compared to the year immediately after vaccination, according to the report published online June 10 inAnd kids between 7 and 11 have double the risk if they are more than six years away from their last shot, compared with less than three years after, the findings showed.
Despite high vaccination rates, the United States and other countries have seen large whooping cough outbreaks since the 1990s, when a new acellular pertussis vaccine replaced the prior whole-cell pertussis vaccine, the researchers said in background notes.According to Dr. Kathryn Edwards, director of the Vaccine Research Program at Vanderbilt University in Nashville, Tenn.,"The old vaccine worked very well, but it was associated with a lot of local reactions and a lot of fever.
Vaccination rates among these children were strong. Only 1% went unvaccinated; 3% were undervaccinated. The statistics revealed that risk of whooping cough steadily increases the longer it's been since a child's last shot.
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