They don’t really send out spies so much as they recruit. The FBI arrested a man just a few days ago for attempting to give details on top secret Raytheon weapons systems to the Chinese government. But as it relates to the Coronavirus? I don’t think people have to worry about “spies”.
Not sure at the moment. There are hundreds of Americans alone still being added to quarantines, 20 people confirmed infected on a cruise ship, and it seems like the R0 is potentially much higher than what is being reported officially.