t depends on the type of zombie. When speaking in realistic terms, scientists expect that a mutated form of rabies, like what we saw in I Am Legend, is a real possibility not only as a form of zombie virus but actually as one that has a reasonable chance of happening.
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The zombies from World War Z is also another realistic possibility. That virus makes them aggressive and want to spread the virus but then sends them into a dormant state while there isn’t any fresh meat for them to eat.