No abstract available
MeSH terms
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Antibodies, Viral / blood
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COVID-19 / epidemiology*
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COVID-19 / physiopathology
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COVID-19 Nucleic Acid Testing*
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COVID-19 Serological Testing*
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Child
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Child, Preschool
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China / epidemiology
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Family
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Female
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Hospitalization / statistics & numerical data
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Humans
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Immunoglobulin G / blood
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Immunoglobulin M / blood
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Infant
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Infant, Newborn
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Male
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Retrospective Studies
Substances
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Antibodies, Viral
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Immunoglobulin G
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Immunoglobulin M