Ok Maybe this is far fetched..

My Government in Hiding theory finds a Cure.

They spread it through out the world via Chemtrails.

It actually kills infected people.. So if Tanya and Saul are infected they would die too. Cause the cure is a bio weapon designed to attack and kill the virus and the host. So if any one is infected regardless if they have turned or not, they die.

Then a few of the Survivors are found and thus begins our Story..


Well it was a thought that hit me this am driving to working thinking about it would be cool if they found a cure. Then I thought about delivery methods..