re: corona statistics look worse for developed western countries.. low overall immunity?

I think that is not likely to hold true as people die in droves of infectious diseases in general in developing countries. But I get where you are going with that. One thing I have heard floating around attributes that observation (if it is indeed true, which I am skeptical of) to our old friend the BCG vaccine, which in addition to being used in developing countries to protect against TB, is purported by some to be an overall immune modulator. Throw that in google and see what comes out the other side. I'm not linking anything.