Study Shows Miscarriage Risk May Have Increased after Flu Shots, Puzzling Researchers

September 13, 2017

(STAT News) – Sometimes when scientists study things, they come up with results they didn’t expect, can’t explain, and may secretly wish they’d never sought. A new journal article looking at whether getting a flu shot during pregnancy increases a woman’s risk of miscarrying may be one such case. The article reports that at least in the 2010-11 and 2011-12 influenza seasons, pregnant women who were vaccinated against flu may have been at a higher risk of suffering a miscarriage — but only if they had also received a flu shot in the previous year as well. The results, published Wednesday in the journal Vaccine, are puzzling and contradict earlier research.

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