There are lots of other nasty bugs around. I am just about fully recovered from what the doctor diagnosed as a severe bacterial infection. The kind that can turn into sepsis.
I was ill for six weeks from start to finish, including a couple of days in hospital and I am now building my stamina up again. Six weeks unable to do much other than lie around and feel sorry for myself is really bad for fitness and exercise routines and I reckon it will be another month before those is back to normal. In my late 70s, it really is use it or lose it.
In fact during the COVID saga, both DH and DD were critically ill for months and came close to death, but none of us have had COVID
I've just done a search and can't find 'concussion' on here...