Support WBURHow long COVID sheds light on other mysterious (and lonely) chronic illnessesPlay43:16Download AudioTerry GrossFebruary 28, 2022 Share"Long COVID is characterized by a wide variety of symptoms that persist long after the initial infection with the SARS-CoV-2 virus," says Meghan O'Rourke, author of The Invisible Kingdom. (Getty Images/Collection Mix: Sub)