1. Cord Blood SARS-CoV-2 IgG Antibodies and Their Association With Maternal Immunity and Neonatal Outcomes
- Author
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Addy Cecilia Helguera-Repetto, Isabel Villegas-Mota, Guadalupe Itzel Arredondo-Pulido, Jorge Arturo Cardona–Pérez, Moises León-Juárez, Maria Antonieta Rivera-Rueda, Gabriela Arreola-Ramírez, Paloma Mateu-Rogell, Sandra Acevedo-Gallegos, Gloria Elena López-Navarrete, María Yolotzin Valdespino-Vázquez, Guadalupe Martínez-Salazar, Mario Rodríguez-Bosch, Irma Alejandra Coronado-Zarco, María del Rosario Castillo-Gutiérrez, Carlos Alberto Cuevas-Jiménez, Elsa Romelia Moreno-Verduzco, Salvador Espino-y-Sosa, Manuel Cortés-Bonilla, and Claudine Irles
- Subjects
pregnancy ,COVID-19 ,newborn ,seropositivity ,SARS-CoV-2 antibodies ,Pediatrics ,RJ1-570 - Abstract
Passive transplacental immunity is crucial for neonatal protection from infections. Data on the correlation between neonatal immunity to SARS-CoV-2 and protection from adverse outcomes is scarce. This work aimed to describe neonatal seropositivity in the context of maternal SARS-CoV-2 infection, seropositivity, and neonatal outcomes. This retrospective nested case-control study enrolled high-risk pregnant women with a SARS-CoV-2 RT-PCR positive test who gave birth at the Instituto Nacional de Perinatología in Mexico City and their term neonates. Anti-SARS-CoV-2 IgG antibodies in maternal and cord blood samples were detected using a chemiluminescent assay. In total, 63 mother-neonate dyads (mean gestational age 38.4 weeks) were included. Transplacental transfer of SARS-CoV-2 IgG occurred in 76% of neonates from seropositive mothers. A positive association between maternal IgG levels and Cycle threshold (Ct) values of RT-qPCR test for SARS-CoV-2 with neonatal IgG levels was observed. Regarding neonatal outcomes, most seropositive neonates did not require any mechanical ventilation, and none developed any respiratory morbidity (either in the COVID-19 positive or negative groups) compared to 7 seronegative neonates. Furthermore, the odds of neonatal respiratory morbidity exhibited a tendency to decrease when neonatal IgG levels increase. These results add further evidence suggesting passive IgG transfer importance.
- Published
- 2022
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