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. 2022 May 6;82(5):501–509. doi: 10.1055/a-1768-0415

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The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution-NonDerivative-NonCommercial License, permitting copying and reproduction so long as the original work is given appropriate credit. Contents may not be used for commecial purposes, or adapted, remixed, transformed or built upon. ( https://creativecommons.org/licenses/by-nc-nd/4.0/ )

This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License, which permits unrestricted reproduction and distribution, for non-commercial purposes only; and use and reproduction, but not distribution, of adapted material for non-commercial purposes only, provided the original work is properly cited.

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Fig. 1 — Regression lines, with 95% confidence intervals, for maternal (R ² = 0.5813) and umbilical cord blood (R ² = 0.7113) IgG seropositivity relative to the infection-to-birth interval (weeks). Blue circles indicate percentages (Y axis) of mothers, while green dots represent percentages of umbilical cord blood testing positive for anti-SARS-CoV-2 IgG for the indicated weeks between infection and birth (X axis). The regression lines differed significantly (comparison of fits: p < 0.0001, F = 8.958; dfn = 4, dfd = 340). Note the delayed response in seroconversion by one week between mothers and their offspring early after infection.