Writer F.T. Kola returns to recount her experience with long COVID. What explains its strange constellation of symptoms? Will it ever go away? And why does vaccination seem to help? F.T., Jim, and Maeve are joined by Dr. Akiko Iwasaki, an immunologist investigating long COVID at her Yale lab. She explains what we know about the condition — and how two theories about its root cause mean the difference between a cure and no clear end in sight. Jim's piece on herd immunity: How Herd Immunity Happens Support this show and all of The Atlantic’s journalism by becoming a subscriber at theatlantic.com/supportus. Learn more about your ad choices. Visit megaphone.fm/adchoices