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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Adult
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Aged
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Aged, 80 and over
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Antibodies, Viral / blood*
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China / epidemiology
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Data Collection
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Female
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Humans
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Influenza A virus / immunology*
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Influenza, Human / epidemiology
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Influenza, Human / immunology*
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Male
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Middle Aged
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Seroepidemiologic Studies
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Urban Population
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Young Adult