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• W3146035771 abstract "ABSTRACT Objective To investigate the association of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2) viral load and infection‐to‐delivery interval with maternal and cord serum concentrations of anti‐SARS‐CoV‐2 immunoglobulin G (IgG) antibodies and transplacental transfer ratio in pregnant women with active or recovered SARS‐CoV‐2 infection. Methods This was a prospective case series of consecutive pregnant women with laboratory‐confirmed SARS‐CoV‐2 infection between 27 March 2020 and 24 January 2021. We collected information regarding deep throat saliva or nasopharyngeal swab (NPS) reverse transcription polymerase chain reaction (RT‐PCR) test results, serial cycle threshold (Ct) values at and after diagnosis, demographic, clinical and outcome data, and neonatal NPS RT‐PCR results. Qualitative and quantitative analysis of IgG and immunoglobulin M (IgM) antibodies against SARS‐CoV‐2 was performed in maternal and cord blood serum samples obtained at delivery. Correlation of maternal Ct values, infection‐to‐delivery interval, infection duration and viral load area under the curve (AUC) with gestational age (GA) at diagnosis, maternal and cord serum IgG concentrations and transplacental transfer ratio of IgG were evaluated using Pearson's correlation. Results Twenty pregnant women who consented to participate and who had delivered their babies by 31 January 2021 were included in the study, comprising 14 who had recovered from coronavirus disease 2019 (COVID‐19) and six with active infection at delivery. The median GA at clinical manifestation was 32.7 (range, 11.9–39.4) weeks. The median infection‐to‐delivery interval and infection duration were 41.5 (range, 2–187) days and 10.0 (range, 1–48) days, respectively. The median GA at delivery was 39.1 (range, 32.4–40.7) weeks and the median seroconversion interval was 14 (range, 1–19) days. Of 13 neonates born to seropositive mothers with recovered infection at delivery, 12 tested positive for anti‐SARS‐CoV‐2 IgG. All neonatal NPS samples were negative for SARS‐CoV‐2 and all cord sera tested negative for IgM. The median transplacental transfer ratio of IgG was 1.3 (interquartile range, 0.9–1.6). There was a negative correlation between infection‐to‐delivery interval and anti‐SARS‐CoV‐2 IgG concentrations in maternal ( r = –0.6693, P = 0.0087) and cord ( r = –0.6554, P = 0.0068) serum and a positive correlation between IgG concentration in maternal serum and viral load AUC ( r = 0.5109, P = 0.0310). A negative correlation was observed between transfer ratio and viral load AUC ( r = –0.4757, P = 0.0409). Conclusions In pregnant women who have recovered from COVID‐19, anti‐SARS‐CoV‐2 IgG concentrations at delivery increased with increasing viral load during infection and decreased with increasing infection‐to‐delivery interval. The median transplacental transfer ratio of IgG was 1.3 and it decreased with increasing viral load during infection. © 2021 International Society of Ultrasound in Obstetrics and Gynecology." @default.
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• W3146035771 date "2021-06-01" @default.
• W3146035771 modified "2023-10-13" @default.
• W3146035771 title "Relationship between viral load, infection‐to‐delivery interval and mother‐to‐child transfer of <scp>anti‐SARS‐CoV</scp>‐2 antibodies" @default.
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• W3146035771 doi "https://doi.org/10.1002/uog.23639" @default.
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