Ready for what? Ready to die? If it's a mankind ending virus, then there's nothing to be prepared for.

As for in general, mankind is not ready for anything. People don't care about anything and tend to ask too late about fixing a problem when usually the harm is already done or further harm is unavoidable.

Given the history lessons, I think it's becoming clear that we will eventually die out from some kind of a virus, perhaps one that is following some nuclear disaster. I don't think we'll die with the Earth, drown in it or get burned by the sun before some virus finishes us off. With our help of course. But that's several millenia ahead.