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Be afraid. Be very afraid.
Scientists recognize three basic types of flu virus: type A, type B, and type C. All three can infect humans, but types B and C don't cause pandemics. Type A influenza comes in a variety of subtypes that infect birds, pigs, horses, seals, whales, humans, and other animals. Some type A flus can cause pandemics, and some are very lethal. Today's killer bird flu, labeled H5N1, is a nasty type A flu.
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