My wife just told me that two of her co-workers were in Wuhan in Late November visiting a factory and they both got the flu in Wuhan.
One guy A, tested negative for the flu, he was sick for 6 weeks, he would start to feel better than get sicker. His doctor told him that he had no idea what was wrong with him. The guy A, said it was the strangest flu he ever had. Over the 6 weeks he was sick he worked from home the entire time and was only working part time for most of those 6 weeks because of how bad he felt.
The other guy B, I don't know if B was tested for the flu, was sicker than A, and he was sick for 8 weeks. He also worked from home for the entire time, my wife doesn't work closely with B, so she's not sure how much time he missed during those 6 weeks.