Fear. No-one wants to be in that 0.65%. Also with finite medical facilities that number quickly goes up to 5-10% or worse if a lot of people get sick at once.

Fear. No-one wants to be in that 0.65%. Also with finite medical facilities that number quickly goes up to 5-10% or worse if a lot of people get sick at once. And then there is the fact that even if you don't die, the disease can be debilitating, for some for the rest of their lives.