The interaction between a mutated virus and its host is that the host often takes a couple generations to adapt. During which time, the human species may all but die off, except for the hardy few. But as Paul asks, don't panic, that's nature.
If a virus doesn't get us, then an asteroid or earthquake will. Try not to worry about it.
Another consequence of the runaway meat industry. We should impose a large tax on meat to provide for public health, medical care, and death benefits caused by people's consumption of meat, and the pig and poultry flus they foster (as well as the inevitable cow flu). Not to mention environmental cleanup, climate change reduction, reforestation, etc.
I'm pushing 50. It's all downhill from there. I've got no kids to worry about. Que sera, sera.
If a virus doesn't get us, then an asteroid or earthquake will. Try not to worry about it.