Yes, as far as I can tell. I had some co-workers who had Covid really bad last March. My case wasn't that bad, but I've been short of breath, and haven't really been able to focus on things ever since. Unfortunately, testing really wasn't a thing back then, and by the time I did get tested as part of my workup, it was negative for an active infection. If I talk for an extended period, walk a block or two, or just go up/down the stairs, I'm winded and have to rest.