The virus starting on the east coast, it stays warm in the south and I think that Fl. Georgia, and a couple of the other states in the warmer areas were hit first. As people tried to travel north and west, they took the virus unintentionally with them, dying along the way, (and eating there way across country.) if this started in Oct 2010 then by Dec or Jan it probable would, be hitting the western States. Therefore Tobias, apparently knew somehow what was coming even though the government was keeping it quite until the video was on the local news and U-tube that everyone was watching at the school.. Also the church was empty when they checked it to, so we're did all those bodies go? Remember the virus is in everyone one. They just don't know it yet as we see at the end with the them wondering what is going on.