Main Findings
The present study explored the rate of vertical transmission and humoral
immune responses following maternal SARS-CoV-2 infection during
pregnancy. Evidence of a vertical transmission rate of at least 11% was
observed. In addition, the highest rate of positive serology tests was
among women who delivered 8-12 weeks post-infection, after which, the
rate of positive serology tests declined gradually. Women delivering 20
or more weeks after infection, only carried anti-spike IgG antibodies.