The coronavirus caught up to President Biden and Dr. Anthony Fauci in the third year of the pandemic, but the high-profile seniors have another thing in common — they both got hit by “Paxlovid rebound,” in which people test positive even after they seemed to kick COVID-19 away.
Mr. Biden, 79, remained stuck in isolation at the White House on Monday instead of touting his agenda across the country as planned this week. He completed a course of Pfizer’s antiviral drug and tested negative last week, only to register a positive result on Saturday and again on Monday.