1 in 5 Adult Covid Survivors in the U.S. May Develop Long Covid, Says CDC The New York TimesCOVID long haulers experience symptoms more than a year after infection CBS ChicagoLong COVID's underlying causes still elusive in new study : Shots - Health News NPRBrain fog, other long Covid symptoms can last more than a year, study finds NBC NewsNIH conducts research in Colorado on long COVID FOX31 Denver