How Often Do Severe Events Occur After Vaccines? By Vincent Iannelli, MD / July 9, 2019 / adverse events, allergic reactions, anaphylaxis, benefits, brain damage, case reports, coincidence, deafness, MMR vaccine, reporting vaccine side effects, risks, scared, seizures, side effects Why do some parents still think that severe vaccine reactions are common? Share this:FacebookTwitterRedditPrintLinkedInPinterestEmailTumblrWhatsAppLike this:Like Loading...