I was waiting for Shane to be bitten on the hand when he was stabbing zombies in the head. We were talking about this at work and came up with some theories.
Could it be that the virus has mutated? In order for it to spread so fast initially, maybe any any contact (sweat, spit, blood) and you were infected. Then it went to saliva only. That would make more sense on how soldiers/police got infected via blood splatter. Or maybe the virus can only survive in the skull so that's why bites are infectuous since the virus leaks into the mouth cavity.
It would be a kicker if they found out that the virus can no longer be transmitted, and all they had to worry about was being attacked.
63tb