NEW: Severe Allergic Reactions

We are thrilled to bring you a brand new episode of Medical Mysteries today and for the foreseeable future. We thank you for your patience during this unprecedented time. When 10-year-old Morgan Smith was on a Colorado camping trip with his family in 2006, everything was going fine. But when he bit into a piece of fish—everything changed.  Learn more about your ad choices. Visit podcastchoices.com/adchoices