Quote Originally Posted by Turfdawg67 View Post
Because all viruses are different? The flu has never gone away.
I think that's bc the flu mutates. There are four strains (A through D, with only A and B being prevalent I believe) and A and B mutate often, thereby decreasing immunity.

Early studies show minimal mutation of covid 19, so that is good. It is a RNA virus and several of those have been largely eradicated without a vaccine because they didn't mutate fast enough to outpace immunity.