COVID-19's "long haulers"

At first, we were told COVID-19 would generally last about two weeks. So why are there more and more people whose symptoms are lingering for months? Today on The Signal, meet Mimi. She was a healthy 29-year-old before she caught the virus in April, but has been dealing with a range of mysterious and frightening symptoms for months now.  Mimi is part of a desperately unlucky group that researchers are finally starting to notice. They're COVID-19's long haulers. Featured: Mimi, COVID-19 patient