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Influenza causes the greatest morbidity and mortality at the extremes of life. Young infants are especially vulnerable, and influenza vaccine is not licensed for use before age 6 months. To determine the effect of maternal influenza vaccination during pregnancy on infant outcomes during the first 6 months of life, researchers reviewed records for nearly 250,000 mother–baby pairs born at hospitals in Utah and Idaho during influenza seasons from 2005 to 2014.
Overall, only 10% of women reported receiving influenza vaccine during the pregnancy; however, vaccine coverage increased over the study period from roughly 2% to more than 50%. There were no differences in pregnancy outcomes, including rate of prematurity and birth weight, between infant…