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. 2021 Jul 7;11(7):e053036. doi: 10.1136/bmjopen-2021-053036

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© Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution 4.0 Unported (CC BY 4.0) license, which permits others to copy, redistribute, remix, transform and build upon this work for any purpose, provided the original work is properly cited, a link to the licence is given, and indication of whether changes were made. See: https://creativecommons.org/licenses/by/4.0/.

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Correlation of cord blood and maternal IgG and distribution of IgG transplacental transfer ratio. (A) Scatterplot shows the correlation of cord blood SARS-CoV-2 IgG levels in y-axis and maternal blood SARS-CoV-2 IgG levels in x-axis in relative fluorescent unit (RFU). (B) Scatterplot shows the distribution of IgG transplacental ratio (cord blood/maternal blood SARS-CoV-2 IgG levels) in the y-axis and days from maternal first positive SARS-CoV-2 PCR test to delivery in x-axis. (C) Scatterplot shows the distribution of IgG transplacental ratio in the y-axis and gestational age at the time of delivery in x-axis. (D) Scatterplot shows the distribution of IgG transplacental ratio in the y-axis and gestational age at the time of maternal first positive SARS-CoV-2 PCR test in x-axis. The different colours represent the severity of the maternal symptoms at the time of diagnosis.