That 640,000 number is not necessarily the number of cases, it represents an update at a specific location about the number of cases there are

In other words, each of those 640,000 updates likely represent multiple cases which, when added up, go well into the millions of cases https://t.co/Vgo0p5xu9i pic.twitter.com/TRo610V0v9

— Ryan Saavedra (@RealSaavedra) May 18, 2020