@ebrown p,
Like farmer, I've been a wiseass here, but I also agree with him about the importance of "shoot-first-ask-questions-later" in this sort of situation. Because of the incubation period of viruses -- the stretch of time between infection and showing symptoms, during which time the infected individual becomes contagious his/herself, the only effective approach is to stop movement and wait for symptoms to appear.
I've had to manage this (on a much smaller scale, of course) with a shelter canine parvovirus situation. (Very contagious, highly fatal, practically untreatable.) On day one of the crisis, everybody was on board with the need to quarantine, test, then wait and monitor. After a few days, people get frustrated and want things to go back to normal. But it does take a while to really find out how many cases there are, how they are distributed, and who might have been exposed. Every week you don't take measures to prevent spread of disease is another week you have to wait to get a handle on the situation.
Of course there's the don't-cry-wolf risk, but there's also the risk of not responding until the situation has gotten away from your ability to stop it. To switch scenarios, I'm sure that people who left Mt. St. Helens before it erupted were happy to have had and responded to an early warning system. The folks in Mammoth Lakes who lost homes and businesses because of a false alarm, not so much. But whatcha gonna do?
The news media, on the other hand, are, as ever, a bunch of opportunist spineless clowns, and should be viewed with suspicion and skepticism.