None of them even considered that they had it before the tes

I wonder how many had it already and never even knew? I'm not surprised that there are positive test results coming in, I'd kind of assumed there'd be a good number. I wonder what the percentage is of incoming positive tests across all athletes returning, and how it compares to already existing infection rates? At the very least, it seems like scientists can learn a lot about the infection rates/effects of a very small demographic of people, from the return of college athletes to a closely observed setting.