In the zombie flicks 28 Days Later and I Am Legend, an unstoppable viral plague sweeps across humanity, transforming people into mindless monsters with cannibalistic tendencies. Though dead humans can't come back to life, certain viruses can induce such aggressive, zombie-like behavior. For instance rabies—a viral disease that infects the central nervous system. Combine rabies with the ability of a flu virus to spread quickly through the air and you might have the makings of a zombie apocalypse. (source: news.nationalgeographic.com)
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