New clues to the biology of long COVID are starting to emerge

https://www.npr.org/sections/health-shots/2021/11/12/ [login to see] /long-covid-causes-treatment-clues
Kelly LaDue thought she was done with COVID-19 in the fall of 2020 after being tormented by the virus for a miserable couple of weeks.

"And then I started with really bad heart-racing with any exertion. It was weird," says LaDue, 54, of Ontario, N.Y. "Walking up the stairs, I'd have to sit down and rest. And I was short of breath. I had to rest after everything I did."