Vaccines and Mast Cell Activation Syndrome By Vincent Iannelli, MD / March 27, 2021 March 28, 2021 / allergic reactions, anaphylaxis, COVID-19 vaccine, mast cell activation syndrome, mast cells, mastocytosis, SARS-CoV-2 Experts are finding that COVID-19 vaccines are safe, if you have mast cell activation syndrome. Share this:FacebookTwitterRedditPrintLinkedInPinterestEmailTumblrWhatsAppLike this:Like Loading...