A puzzling study of U.S. pregnancies found that women who had miscarriages between 2010 and 2012 were more likely to have had back-to-back annual flu shots that included protection against swine flu.
Vaccine experts think the results may reflect the older age and other miscarriage risks for the women, and not the flu shots. Health officials say there is no reason to change the government recommendation that all pregnant women be vaccinated against the flu. They say the flu itself is a much greater danger to women and their fetuses.
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