More People Are Getting COVID-19 Twice, Suggesting Immunity Wanes Quickly in Some

November 18, 2020

(Science) – Scientists are keenly interested in cases like hers, which are still rare but on the rise. Reinfections hint that immunity against COVID-19 may be fragile and wane relatively quickly, with implications not just for the risks facing recovered patients, but also for how long future vaccines might protect people. “The question everybody wants to answer is: Is that second one going to be less severe most of the time or not?” says Derek Cummings, who studies infectious disease dynamics at the University of Florida. “And what do reinfections teach us about SARS-CoV-2 immunity in general?”