Scientists don’t understand why so many people suffer from Covid-19 symptoms for months, well after they stop testing positive. But that’s just the start of the mystery. There are other diseases that cast these long shadows, and they point to a major blind spot in medicine.For more, go to http://vox.com/unexplainableIt’s a great place to sign up for our newsletter, view show transcripts, and read more about the topics on our show.Also, email us! unexplainable@vox.comWe read every email.Support Unexplainable by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices