I am Darkness, I am the Knight, I. Am. Swine flu.

[Pinky]

Its highly contagious nature is the crux of the problem. The more it spreads, the more likely it is to mutate. Given the fact that it easily traveled across the continent during the summer season, which means we can't simply wait it out, it's only going to become more problematic during the winter season when people traditionally spend the more time grouped together in closed environments.