No abstract available
MeSH terms
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Adolescent
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Age Factors
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Antigens, Viral / blood
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COVID-19 / diagnosis*
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COVID-19 Nucleic Acid Testing
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COVID-19 Serological Testing / methods*
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Child
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Child, Preschool
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Confidence Intervals
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Cross-Sectional Studies
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Humans
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Infant
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SARS-CoV-2 / immunology*
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Sensitivity and Specificity
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Symptom Assessment
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Young Adult