Antibody reactivity to SARS-CoV-2 is common in unexposed adults and infants under 6 months.
medRxiv : the preprint server for health sciences（2020）
摘要
A majority of unexposed adults have pre-existing antibody reactivity against SARS-CoV-2. The lack of similar antibody reactivity in infants where maternal antibodies have waned suggests that this cross-reactivity is acquired, likely from repeated exposures to circulating coronaviruses.
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