New research suggests that mothers with COVID-19 produced a strong antibody response; however, the antibody transfer across the placenta to the infants was less efficient than what was anticipated.

A study conducted among pregnant women who had COVID-19 infection detected neutralizing activity in 94% of maternal blood samples but only 25% of cord blood samples, reported researchers. The overall cord-to-maternal anti-receptor binding (RBD) immunoglobulin (Ig)G ratio was found to be 81%. The findings were presented at the annual meeting of the Society for Maternal-Fetal Medicine. Naima Joseph, of Emory University in Atlanta, stated during her presentation that though anti-RBD domain IgG titers were identified in umbilical cord samples, the efficiency of transfer was found to be less than 1… (Medpage Today)