[IndispensableDestiny]

If we were 99 percent immune, then we would expect only about a tenth of the cases reported in the US.

[Republican Wildcat]

I think the doctor in the post is referring to already having been infected. You can’t have a “memory” of immunity from something you haven’t had before. That doesn’t seem to be the impression the poster wanted to provide, however.

[semimojo]

If we were 99 percent immune, then we would expect only about a tenth of the cases reported in the US.

The good doctor clearly doesn’t believe in herd immunity.