EYECARE: Coronavirus BRIEFING: The Latest COVID-19 Data Paxlovid, Rebounds and How It Works By Staff Wednesday, August 3, 2022 12:05 AM Last week, President Biden experienced a COVID "rebound," in which he tested positive, tested negative and then tested positive again. This is a rare occurrence linked to Paxlovid, the COVID treatment the President took. So how does Paxlovid work and how do rebounds happen? Head over to NPR to learn more about the safe, effective treatment.