I've been going over this in my head for weeks now, ever since Croatoan aired. If there is a demon virus, there should also be an anti-virus. There is a natural balance to everything, and evil could not make something bad without good making something to balance it all out. It's just the natural order of things: dark and light, day and night, good and evil, male and female,etc. So, if there is a demon virus, then there should be a demon virus cure. Wondering if maybe it's one of the children....

hey thats a really gud thought. yeah there must be a way to counteract it. but how? it cud be one of the demon kids actually. woop woop

This is a very fair assumption. I have never actually thought of this. To every UP there must be a DOWN. I think it would be an awesome story twist if the only thing that could end evil would be someone who posessed evil within himself. Maybe the particular power that the "child" endows can be altered to be used against that in which it was intended to destroy.

And the anti-virus could very well be Sam. Or it could be Dean.