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Transplacental transmission of SARS CoV-2 virus and antibodies in pregnant women and their new-borns according to the trimester of maternal infection: A French multicentre prospective study
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  • Louise Lucot-Royer,
  • Charline Bertholdt,
  • Solene Marty-Quinternet ,
  • Jean Paul Bory ,
  • Christine Devalland ,
  • Margaux Canaguier,
  • Camille Coppola ,
  • Marie-Laure Eszto ,
  • Edgar Montoya Ramirez,
  • Sandrine Reviron,
  • Didier Riethmuller,
  • Emma Rufenacht,
  • Marion Roesch ,
  • Emmanuel Simon,
  • Marc Puyraveau ,
  • Frederic Mauny ,
  • Nicolas Mottet
Louise Lucot-Royer
Hospital Jean Minjoz

Corresponding Author:louiselucot@hotmail.fr

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Charline Bertholdt
Maternite universitaire CHRU de Nancy
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Solene Marty-Quinternet
Hospital Jean Minjoz
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Jean Paul Bory
Reims Champagne-Ardenne University
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Christine Devalland
Hôpital Nord Franche-Comté
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Margaux Canaguier
Hôpital Nord Franche-Comté
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Camille Coppola
Haute-Saône Hospital Group
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Marie-Laure Eszto
CHR Metz-Thionville
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Edgar Montoya Ramirez
Groupe Hospitalier de la Region de Mulhouse et Sud Alsace
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Sandrine Reviron
Centre Hospitalier de Lons-le-Saunier
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Didier Riethmuller
Grenoble Alpes University Hospital
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Emma Rufenacht
Centre Hospitalier de Pontarlier
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Marion Roesch
Regional Hospital Centre Metz-Thionville
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Emmanuel Simon
CHU Dijon
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Marc Puyraveau
Hôpital Jean Minjoz
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Frederic Mauny
Hôpital Jean Minjoz
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Nicolas Mottet
CHU Besancon
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Abstract

Objective: To quantify the transplacental transmission of SARS-CoV-2 and antibodies in pregnant women and their new-borns according to the trimester of maternal infection. Design: This was a prospective observational multicentre study including pregnant women with positivity for SARS-CoV-2 by reverse transcription–polymerase chain reaction (RT‒PCR) or positivity by serology from April to December 2020. The study was designed to perform a systematic collection of mother/new-born dyad samples at birth. Setting: Eleven maternity wards in Eastern France Population: Pregnant women with confirmed COVID-19 infection during pregnancy and their new-borns. Methods: The SARS-CoV-2 viral load was measured by RT‒PCR. IgG and IgM antibodies to the receptor-binding domain of the SARS-CoV-2 spike protein were measured by enzyme-linked immunosorbent assay. Antibody concentrations and transplacental transfer ratios were analysed according to the term of maternal infection. Main Outcome Measure: SARS-CoV-2 viral load in maternal plasma or respiratory fluids and umbilical cord plasma and quantification of anti-SARS-CoV-2 antibody transfer. Results: Among 165 dyads enrolled, one congenital infection was confirmed (n=1 (0.63%) IC95% [0.02%; 3.48%]). Among 165 maternal sera tested, 107 (64.8%) were positive for IgG with a concentration > 25.6 BAU/ml. The average placental transfer ratio was 1.27 (95% CI [0.69–2.89]). The transfer ratio increased with increasing time between the onset of maternal infection and delivery (P value = 0.0001). Conclusions: We confirmed very low SARS-CoV-2 transplacental transmission of less than 1%. Transmission of antibodies is more likely when the infection occurs in the first or second trimester of pregnancy.