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並前往https://www.webmd.com/cold-and-flu/flu-guide/h1n1-flu-virus-swine-flu

H1N1 Flu Virus (Swine Flu): Symptoms, Causes, Tests - WebMD

H1N1 flu is also known as swine flu. It's called swine flu because in the past, the people who caught it had direct contact with pigs.

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