The idea that the virus might have had a gestation period seems to work better. If we are to believe that the zombies spread as quickly as they did, then they would have had to have popped up in multiple locations simultaneously, because the trek from LA to say...Austin, TX is filled with looooooong stretches of desert. Given that there's a military base in El Paso along that trip, I'd be surprised if the zombies made it into Texas at all.
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