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What is Swine Flu, or H1N1?

Greg Poland, M.D., Professor of Medicine, Director, Mayo Vaccine Research Group, Mayo Clinic
May 27, 2009

Question: What is swine flu, or H1N1?

Cold Flu
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Answer: In some respects it's just like any other influenza virus. It's a virus that causes a predominantly respiratory illness. What's unique about this swine flu is that it is a mutated type of virus so that nobody in the U.S. or probably world wide has any immunity to it. Hence it's ability to cause widespread infections.

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