If it's a virus, viruses change and mutate all the time. Look at bird flu and swine flu, both started in animals and then mutated to infect humans. It's highly plausible that the virus, if that is the cause, has been incubating in the walkers and mutating...becoming easier to transmit.
Looked to me like someone was living in that bus. Perhaps the 2 cops had something to do with the burnt bodies, the locking of the gates, and the walkers in the building. Maybe they were infected somehow and did what they could to contain it inside the yard.
That's the beauty of this show, all these side things that keep you talking about it...
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