No abstract available
Publication types
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Letter
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Research Support, N.I.H., Extramural
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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, Neutralizing / blood
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Antibodies, Viral / blood
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China / epidemiology
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Communicable Diseases, Emerging / epidemiology*
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Communicable Diseases, Emerging / immunology*
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Cross Protection
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Cross Reactions
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Disease Outbreaks*
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Humans
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Influenza A Virus, H1N1 Subtype / classification
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Influenza A Virus, H1N1 Subtype / immunology*
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Influenza, Human / epidemiology*
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Influenza, Human / immunology*
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Middle Aged
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Neutralization Tests
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Seroepidemiologic Studies
Substances
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Antibodies, Neutralizing
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Antibodies, Viral