Yet not even in the darkest times of story the way to deal with a plague was to torch the country and all the peoples on it. The typical procedure is to try to find a cure or at least proper isolation/detection methods
There are times where it would certainly have been the best solution, if people had had the stomack to do so.

And this isnt just a normal virus we are dealing with, it can be compared to a zombie virus where there on average isnt any loss of intellect, and where early stages of zombies cant be detected visualy.

No wonder people are ready to blow up planets or hive cities to get rid of this.