We included in the study 11 couples in whom 1 of the 2 partners met clinical, epidemiologic, and laboratory criteria for a mildly symptomatic confirmed COVID-19 case. We collected blood samples from both partners of each couple during May 7–June 26, 2020. Ten healthy blood donors who had not been exposed to COVID-19 patients and who had tested negative for SARS-CoV-2 antibodies were enrolled as controls. All participants gave written informed consent for research according to protocols approved by the institutional review board of Strasbourg University Hospitals (ClinicalTrials.gov NCT 04405726).

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