Methods
RT-PCR for viral RNA via a nasopharyngeal swab was performed using the Cobas SARS-CoV-2 6800 platform. Maternal, and fetal serological antibody response, via umbilical cord bloods, was measured using both the Elecsys® immunoassay, Abbott SARS-CoV-2 IgG Assay and the IgM Architect assay.