Same doctor as above link. I only listen to a few of his presentations, not nearly all of them, because he does one about every day and makes them kind of long.

Denninger covered this in one of his blogs too. About how some of the population already had some proportion of immunity before the official pandemic was announced. Still a lot to be learned about his virus.

https://www.youtube.com/watch?v=i195K2vYfnY