I think 5-10 million Americans already have the virus. If I’m wrong, it may be way more than that.
there’s a published, but not peer-reviewed study that put the figure as high as 40 million.
There were a very large number of “flu” cases this Feb-March, that tested negative for the flu, but since there was no COVID test available, none was given.
Compared to a normal year, those numbers were huge, and given the timing, it’s reasonable to suspect that a ton of people may have had COVID-19 but had either the relatively mild flu-like symptoms, or in as many as half the cases, NO symptoms at all.
This is why getting the antibody testing to a robust scale is so important. There may be tens of millions of people who are sheltering at home who are in fact fully immune to the disease, having had it already.
They also are not contagious to others. They would be the key to restarting the economy.