" Amazingly to me, although this concept of variation in individual susceptibility to infectious disease has been explored in the literature for other agents, I have not seen it discussed in regard to the current coronavirus epidemic, and as I said, it has not been incorporated into the models."

Thank You, Kevin Roche.

https://healthy-skeptic.com/2020/05/02/a-stop-the-presses-paper-relating-to-population-immunity/