The loss of the sense of smell affects almost one in every two people who get Covid-19. Usually it resolves within a week or two. But for some, like Dr. Alex McCutchan, smell and taste distortions persist for a year, leaving an invisible illness that disrupts daily life. Scientists like Leah Beauchamp are learning that its significance doesn’t end there. In this episode, Bloomberg’s Jason Gale meets two best friends who are exploring long Covid’s potentially scary, lifelong consequences. Story has been updated to correct Alex McCutchan's name.See omnystudio.com/listener for privacy information.