Side effects from flu vaccines more common in women: study

Use of a trivalent or quadrivalent vaccine made no difference on reactions rates, authors say.

Women are more likely to experience injection site and systemic reactions to flu shots, regardless of age or vaccine type, Canadian researchers say. 

Their meta-analysis shows that for every 1000 influenza vaccinations, an additional 115 cases of injection site reactions and 74 extra cases of systemic reactions could be expected in women versus men.