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www.medscape.com/viewarticle/... "People who have recovered from long COVID can suffer relapses or flare-ups from new viral infections — not just from COVID but from cold, flu, and other viral pathogens, researchers have found."

Cold, Flu Virus Can Trigger Long COVID Relapseswww.medscape.com Those who treat and research long COVID warn that viral persistence and reactivation are real risks for some patients.