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. 2021 Dec 1;58(6):900–908. doi: 10.1002/uog.24787

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© 2021 The Authors. Ultrasound in Obstetrics & Gynecology published by John Wiley & Sons Ltd on behalf of International Society of Ultrasound in Obstetrics and Gynecology.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc-nd/4.0/ License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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UOG-24787-FIG-0003-b — Venn diagram showing peripartum SARS‐CoV‐2 test results and immunoglobulin G (IgG) detection in asymptomatic pregnant women classified according to the World Health Organization criteria for mother‐to‐child SARS‐CoV‐2 transmission as having possible intrauterine transmission (n = 10). Two neonates classified as having possible intrauterine transmission presented passive immunity specific for SARS‐CoV‐2. *Four out of 10 cases with positive maternal IgG had positive amniotic fluid (AF) and two out of six cases with positive neonatal IgG had positive AF, none of which was classified as having possible intrauterine transmission. For simplicity, these intersections are not shown.