Rare cases of COVID returning pose questions for Pfizer pill
A small number of COVID-19 patients are relapsing after taking Pfizer's antiviral pill, raising questions about the drug at the center of the U.S. response effort |!| New London
A small number of COVID-19 patients are relapsing after taking Pfizer's antiviral pill, raising questions about the drug at the center of the U.S. response effort |!| New London