Flu Shots Protect Babies, Too

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Here’s one more reason pregnant women should get a flu shot: It not only protects mothers, but a large study suggests it prevents flu in the infant, too.

Giving babies under 6 months old a flu vaccination does not work. Their immune systems are too immature to mount an effective response. But infants can get the flu, and it can have serious, even deadly, consequences.

Researchers used data on live births among women in a large health maintenance organization, including 23,847 babies born to mothers who had been vaccinated against the flu and 225,540 born to mothers who were not vaccinated. The study, published in Pediatrics, was carried out during the H1N1 flu pandemic of 2009-10.

Babies of unvaccinated women were 70 percent more likely to have a laboratory-confirmed case of flu, and 81 percent more likely to be hospitalized for flu before they were 6 months old.

The lead author of the study, Dr. Julie H. Shakib, an assistant professor of pediatrics at the University of Utah, said that after the 2009-10 pandemic, rates of vaccination of pregnant women went up sharply. In the 2013-14 season, more than 50 percent of pregnant women were vaccinated.

“We were encouraged to see the increase after the pandemic,” she said. “That’s when the public became aware of how much of a risk there was, and when obstetrics practices started delivering the vaccine as a routine part of care.”