Some patients who have been prescribed Pfizer’s pill regimen Paxlovid to tackle Covid-19 have reported feeling cured of the disease after several days of treatment only to then suffer a relapse, a puzzling phenomenon that has been dubbed “Paxlovid rebound”.
The most famous victim to date is US President Joe Biden, who recently contracted the coronavirus, was immediately treated with the drug and duly tested negative, before subsequently testing positive again four days later, albeit this time without symptoms.
