I speculate that they are already infected. You rise again as a walker when you die. No one has changed that didn't succumb to death, be it from massive blood loss, or infection from a scratch or a bite.
Shane most likely became infected when he was trapped in the bus at the public works building. He used his knife to draw blood from his hand to smear on the door of the bus. It was the same knife he used to stab the walker through the fence minutes earlier...
I also think that its gone waterborne, hence the public works guards becoming infected. The people on the farm have been drinking from wells and not the public water source.
Shane most likely became infected when he was trapped in the bus at the public works building. He used his knife to draw blood from his hand to smear on the door of the bus. It was the same knife he used to stab the walker through the fence minutes earlier...
I also think that its gone waterborne, hence the public works guards becoming infected. The people on the farm have been drinking from wells and not the public water source.
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