The knife thing isn't the huge oversight people think it is. After killing a zombie with it, they would have wiped it off. Given that we don't know how exactly it's transmitted or how much of the virus there has to be to overwhelm the immune system, or how long the virus can survive outside a human body, it's entirely plausible that he used the same knife and didn't get infected.
Doesn't mean it was a good idea, though. Stupid Shane.
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