No abstract available
MeSH terms
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Antibodies, Viral / blood
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Humans
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Influenza A Virus, H1N1 Subtype / isolation & purification*
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Influenza, Human / diagnosis
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Influenza, Human / epidemiology*
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Influenza, Human / virology
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Pandemics*
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Retrospective Studies
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Seroepidemiologic Studies