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If by "novelization" you mean the original novel, in Matheson's story vampirism is caused by a bacterium that is sensitive to UV light, so direct sunlight kills the bacterium, which had animated the host body, causing rapid decomposition (and staking works because it introduces air into the body, which switches the bacterias metabolism from ...


1

In the movie, the creatures are somewhat like vampires but we see no direct evidence that they drink blood although they seem to be attracted to blood (which is used as a lure) and perhaps they do explicitly drink blood since instead of "dark seeker" in the original script a term is used for them that involves the root "hemo." (Hemocyte is the term that does ...


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