I have to think diet and general health have something to do with it, though- they came out early and said that Vitamin D has an effect, but not knowing this was coming made it impossible to test the theory because, as you know, tests need to show cause & effect. I know people who have a cold more than once every year, whether they need it or not, yet I and others don't get a cold most years- I haven't had one in over two years. If I had anything, it lasted a couple of days, at most. So far, I haven't had COVID symptoms, even though I know someone who was in the hospital for ten days with it. I asked Aurora and Ascencion Health Care if I could be tested and after answering their questions, they told me I didn't have it but I pressed for more info because I wanted to know, not assume or guess. I was finally able to be tested yesterday and will find out in about a week.