No abstract available
Publication types
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Letter
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Research Support, Non-U.S. Gov't
MeSH terms
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China / epidemiology
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Follow-Up Studies
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Humans
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Influenza A virus / classification*
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Influenza A virus / immunology*
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Influenza, Human / epidemiology*
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Influenza, Human / virology*
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Population Surveillance*
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Seroepidemiologic Studies