Pregnant Women Who Receive Flu shots at Increased Risks of miscarriages, CDC-funded study finds
For women who had not received a flu shot in the previous year, there was no increased risk of miscarriage. However, women who received back-to-back shots, one of which was the vaccine against the 2009 H1N1 virus, had an adjusted odds ratio (aOR) of 7.7 compared to an aOR of just 1.3 for women who had not been vaccinated during the previous flu season.