@thomasfuchs again, I don’t think that’s true. I don’t know it, but what I’ve read seems to indicate it. E.G., I have ehler’s danlos syndrome, which is a collagen deficiency, and people with issues like this seem to be a huge chunk of people getting long covid.
It looks like there’s a solid chance you need some underlying issue to get long covid. That means some people can “safely” get sick again and again, while others get hit because of some issue they did not know they had.