Conclusion
Using two independent serological assays, we present a comprehensive
illustration of the antibody response to SARS-CoV-2 in pregnancy, and
show a low prevalence of asymptomatic SARS-CoV-2. Transplacental
migration of anti-SARS-CoV-2 antibodies was identified in cord blood of
women who demonstrated antenatal anti-SARS-CoV-2 antibodies, raising the
possibility of passive immunity.