No, it's the mid-season finale. But for the life of me, I can't find when the new episodes start in 2014.
In a way, you're talking about two different things. Yes, I guess it's true that people could be infected by a virus or bacteria that would give the impression the infected are zombies, but they're not actual zombies, the mythology of which is what we've seen in most movies.
In addition to your last sentence, a standard element of zombie-ism that is most obviously impossible: having to destroy their brain to kill them. Anyone who's taken Physiology 101 can attest to that. The body is a complicated "machine", with interconnected processes, that requires oxygen & other chemicals to function; chiefly, sodium & potassium in the brain and, from what I recall, calcium in the muscles. Blood is the primary transport through which those chemicals are delivered. If you remove the lungs, you stop the process by which oxygen is delivered to the blood. If you remove the heart, you stop the process by which the blood is pumped, which delivers oxygen to the various parts of the body, and the brain cannot function without oxygen for more than approximately 6 minutes. So, anything that disrupts the flow of oxygen to the brain will kill anyone, regardless of their state.
But zombies that are easy to kill aren't as scary.
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