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How is H1N1 (swine) flu different from seasonal influenza?

April 26, 2017different flu h1n1 Influenza seasonal swine

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How is H1N1 (swine) flu different from seasonal influenza?

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H1N1 is a new flu virus. Because H1N1 is new, people do not have immunity to it, so it can spread quickly through the population. New flu viruses are unpredictable: H1N1 flu may change and become more severe as time goes on.