Vaccinating pregnant women for whooping cough protects newborns, reports Reuters.

For the study, researchers examined data on almost 149,000 infants born in California from 2010 to 2015. They found babies whose mothers got the Tdap booster vaccine for tetnanus, diphtheria and pertussis were 91 percent less likely to get whooping cough during the first two months of life, a critical period before U.S. infants typically get their first dose of the pertussis vaccine.

“It’s very important for pregnant women to get vaccinated,” said lead study author Dr. Nicola Klein of the Kaiser Permanente Vaccine Center in Oakland, California.

“It’s an extremely effective vaccine to protect babies before they are able to get vaccinated on their own,” Klein said in a phone interview.

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