Bugs have their way of creeping around until eradicated, immunized, fizzling out, or survived with whatever treatment, etc. If that bothers people, and if they presume it will be harder to survive than a random chance from flu or whatever else, the data probably not sufficient to know much of anything yet... then avoid random humans to whatever extent they like till then. Will at least buy some time. No point being stupid and trying to become a datapoint.