U.S. researchers looked at 72 pediatric cases of pertussis between 2004 and 2010 and found that approximately 47% of children with the disease had not completed the recommended four doses of the diphtheria, tetanus and acellular pertussis vaccine. Among 288 children who did not get the disease, about 22% were not fully vaccinated. The study published in the journal JAMA Pediatrics showed that the risk of getting pertussis was about 18 times greater among children missing three doses of the vaccine and 28 times greater for those missing all four doses.

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