Another question: We approached this Covid-19 virus differently than all the ones before by taking measures to "flatten the curve'. The benefits were of course to not overload the hospitals, not have everybody get sick at once, and I suppose to buy some time whereupon, if we get lucky, we have a vaccine.
Yet this brings up a couple of thoughts. For one, according to Dr. Fauci and others I presume, many of these nasty viruses come on the scene fast and hard, spike up, and eventually disappear as fast as they came. Almost mysteriously, which might be from gathering immunity or because of milder, less contagious mutations that start to dominate. (If I got this story straight!)
If the decline of those previous epidemics/pandemics can be attributed to 'herd immunity' building up, then we might have a real problem. And that's because antibody protection declines over time- like a half-life I suppose that is most effective the first few weeks (perhaps months) afterwards, correct?
So could it be that by flattening the curve, we've inadvertently created some kind of "loop pattern", that is the 'herd immunity' we could have counted on never really got a foothold, so that those individuals who did build up antibodies, after some period of time, are once again susceptible to infection as the virus rotates among various regions?