Making this worse, the final size of an epidemic can be estimated as not p=1-1/R0, but rather p=1-e^-R0 [1]. With this, those R0 estimates give a final infected population of 95%-~100%... we can't let herd immunity be the solution.

[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3506030/