Probably there already are millions infected (or formerly infected and recovered) in the U.S. alone.

That's the most rational explaination for the need to get a very specific type of test kit developed for the U.S., and for giving cease and desist orders to anyone trying to test in different ways.  Also for all 'science' to be run through Mike Pence's office before it is allowed to be published.

The number of celebrities, basket ball players, etc that have been 'confirmed' would lead a thinking person to conclude that SARS-cov-2 is pretty widespread just by ratios alone.  Of course one does need, in order to be rigorous, to consider that 'jet setters' probably do have more exposure than average.