Results
Among participants without SARS-CoV-2 infection, the highest anti-S levels (p value for anti-S levels in maternal and cord plasma were <0.001 and <0.001, respectively) and highest nAb potency against both the Wuhan and Omicron strains (p value for nAb against Omicron strain were both <0.001 for maternal and cord plasma) were observed in maternal and cord plasma in the T3 group.