
Penn Medicine Study Details Robust T-Cell Response to mRNA COVID-19 Vaccines.
Penn Study Details Robust T-Cell Response to mRNA COVID-19 Vaccines—a More Durable Source of Protection Results underline the importance of a second dose and include implications for booster shots Messenger-RNA (mRNA) vaccines against the coronavirus that causes COVID-19 provoke a swift and strong response by the immune system’s T cells—the heavy armor of the immune system—according to a study from researchers in the Perelman School of Medicine at the University of Pennsylvan