No abstract available
MeSH terms
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Adolescent
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Child
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Complement Fixation Tests*
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England
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Epidemiology*
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Hemagglutination Inhibition Tests*
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Humans
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Infant
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Infant, Newborn
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Orthomyxoviridae Infections*
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Orthomyxoviridae*
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Paramyxoviridae Infections*
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Respiratory Tract Infections*
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Seasons*
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Virus Cultivation*