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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. 3 — Third-order cubic polynomial regression line for maternofetal anti-SARS-CoV-2 IgG antibody transfer ratios (c [umbilical cord blood IgG]/c [maternal blood IgG]) relative to the infection-to-birth interval. Note that the ratios increase to more than 1 after six weeks from infection (R ² = 0.2440).