As the world grapples with how to safely reopen society in the midst of the coronavirus pandemic, scientists have been racing to understand whether COVID-19 infection confers immunity—and how long such immunity might last. Researchers Alessandro Sette and Shane Crotty, both professors at the Center for Infectious Disease and Vaccine Research at the La Jolla Institute for Immunology, found COVID-19 infection produces a strong T cell response. PC members learned from the scientists themselves why this is good news in the worldwide race to develop a vaccine against the deadly disease.