Moro PL et al. Am J Obstet Gynecol. 2011 Feb;204(2):146.e1-7. Epub 2010 Oct 20.

Analysis reports of adverse influenza A vaccination (H1N1) effects from the American VAERS database found that both the live attenuated influenza vaccine and the trivalent inactivated influenza vaccine, when administered to pregnant women, showed no association with any unusual complications in pregnancy or adverse effects on the fetus.