Estimates show that 10-to-30 percent of people who become infected with COVID-19 will end up coming down with long-haul COVID symptoms.  Mayo Clinic Dr. Greg Vanichkachorn says symptoms can vary from shortness of breath:

“Some may have a little bit of brain fog, while in others, the symptoms may be quite severe. They may have shortness of breath to the point that they need to remain on oxygen for several months after their infection, or not be able to do some of the basic activities of life.”

Dr. Vanichkachorn says the trouble with long-haul COVID is that it’s so very nebulous, and there are no specific diagnostic criteria yet.