No abstract available
MeSH terms
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Age Distribution
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Age Factors
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Aged
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Aged, 80 and over
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Antibodies, Viral / immunology
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Antibody Specificity
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Antigens, Viral / immunology*
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Child
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Child, Preschool
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Disease Outbreaks*
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Hemagglutinins / immunology
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Humans
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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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Influenza, Human / virology
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Middle Aged
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Time Factors
Substances
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Antibodies, Viral
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Antigens, Viral
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Hemagglutinins