In new research published in Microbiology & Infectious Diseases, immunologist J. Bart Classen warns the mRNA technology used in the Pfizer and Moderna COVID vaccines could create “new potential mechanisms” of adverse events that may take years to come to light.Back in 1999, leading U.S. Food and Drug Administration (FDA) official Dr. Peter Patriarca contended that modern advances in vaccine technology were rapidly “outpacing researchers’ ability to predict potential vaccine-related adverse events.” Patriarca mused that this could lead to “a situation of unforeseen and unpredictable vaccine outcomes.”In a new research article published in Microbiology & Infectious Diseases, veteran immunologist J....