Is This Year’s Flu Shot Only 9% Effective? By Vincent Iannelli, MD / December 28, 2019 / 2019-20 flu season, benefits, flu B, flu deaths, flu vaccine myths, Greta Van Susteren, H3N2, risks, side effects, vaccine effectiveness Reports that this year’s flu shot is only 9% effective aren’t true. Share this:TweetPrintEmailShare on TumblrWhatsAppLike this:Like Loading...