What is COVID-19 rebound and when does it happen? Here’s what we know

U.S. President Joe Biden tested positive for COVID-19 a third time on Thursday after taking an antiviral drug treatment, but an infectious disease expert says “rebound” cases are not an unheard phenomenon and can happen even in people who don’t get the Paxlovid treatment.

“We’re hearing about post-COVID rebound primarily because that’s what happened to President Joe Biden, who got treated (with Paxlovid) and perhaps other treatments…And what we know is that COVID…