Tested negative for Covid-19, only to find you have a rebound case?

US President Joe Biden attends a meeting virtually during his isolation after being diagnosed as having a rebound case of Covid-19 on July 30 (2022). — Reuters

It's been known for several months that rebound infections can occur in Covid-19 patients who were treated with the antiviral medication Paxlovid.

Now the issue is being given renewed attention after US President Joe Biden tested positive again just days after being given a clean bill of health following a SARS-CoV-2 virus infection last month (July 2022).