To determine whether the placental transfer differences were simply related to different levels of glycosylated antibodies on the maternal side, or whether the transfer signatures were conserved across COVID+ and COVID– mothers, we next examined the overall humoral Fc profiles of HA- and PTN-specific or non-specific antibodies in the setting of maternal SARS-CoV-2 infection or non-infection. The gene discussed is PTN; the disease is infection.