Then the medical history is the problem, not the flue. A sane robust body is not supposed to be killed by the flue. If our society produce people that the flue kills, let's focus on those causes. Not the flue.

It's like focusing on making all houses flood proof. Most houses don't need it. If one needs it, relocating the house is probably a better idea that trying to make a new law saying all house should have floaters. The problem is that our society let us build houses on floodable area, not the flood.