Giving women the tetanus, diphtheria and acellular pertussis vaccine during their second or third trimester of pregnancy could avert about 1,012 annual pediatric cases of whooping cough, or about one-third of cases, mostly in 1- and 2-month-olds, a study in the journal Pediatrics showed. Prenatal vaccination lowered rates of infant hospitalization and deaths by 38% and 49%, respectively. Researchers found vaccinating mothers after they gave birth and vaccinating mothers as well as other family members also helped reduce the number of pertussis cases.

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