Drew Weissman, a professor at the University of Pennsylvania and co-recipient of the 2023 Nobel Prize in Physiology and Medicine, addressed concerns raised by ACIP member Retsef Levi regarding the safety of mRNA Covid vaccines. At a recent CDC meeting, Levi suggested that mRNA, lipid nanoparticles, and spike proteins from the vaccines may persist in the body and provoke unknown immune responses. Weissman countered these claims, stating that extensive literature supports the safety and rapid degradation of mRNA. He highlighted that while some studies may suggest prolonged presence, they often rely on flawed methodologies. Weissman affirmed that mRNA does not circulate widely in the body and that vaccines have been tested extensively, proving to be safer than other vaccine platforms. He expressed concern over the ACIP's recent decisions to limit vaccine availability, emphasizing the historical impact of vaccines in saving lives.