No abstract available
Publication types
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Comparative Study
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English Abstract
MeSH terms
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Acute Disease
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Adolescent
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Adult
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Age Factors
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Antibodies, Viral / analysis*
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Child
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Child, Preschool
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Chronic Disease
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Coronaviridae / immunology*
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Germany, West
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Hemagglutination Inhibition Tests
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Humans
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Infant
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Lung Diseases / immunology*
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Middle Aged
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Respiratory Tract Diseases / immunology*