You're on, Dunce boy. Let's say the first case in the US appears Jan 15th. Lots of people are claiming "exponential growth". So let's go with a relatively low number of 25% increase daily. Now obviously the first day can't be exactly a 25% rate because you can't infect a quarter person, but the 25% is a rate steady throughout the time from Jan 15th until today (Mar 16th when I'm posting this).
The standard formula for exponential growth is: a x (1 + r)[sup]t[/sup]
So starting with one infected individual on Jan 15th and and a 25% daily increase for 60 days, you get 1 x (1.25)[sup]60[/sup] which comes out to 652,530. A daily increase of 20% gives you 56,347 which still meets the "tens of thousands" statement. Capiche?