No, 500 million doses is enough for all of us just about twice. But you only need one dose to be immune, as I recall, with this stuff. I think they want a lot on hand in case of outbreaks elsewhere. I've heard that they now have 75 million doses, if they dilute the current stock by 5 or 10 times each dose. That way there'll be enough to contain it if there are outbreaks around the world. Sounds like they want to get a large stock, and not a day too soon!