A new study of 1,733 Covid-19 patients who were discharged from a hospital in Wuhan, China, the original epicenter of the pandemic, suggests that three-quarters of those patients had at least one symptom, like fatigue, muscle weakness or diminished lung function, after six months. And it is not just the severely ill who suffer. A U.S. study showed that symptoms even persisted among some people with mild cases, including young adults.
https://www.nytimes.com/2021/01/21/magazine/long-covid-nightmare.html