Evaluation of Transplacental Antibody Transfer in Pregnant Women Immunized with Different SARS-CoV-2 Homologous or Heterologous Schemes

Maria Elena Romero-Ibarguengoitia, Zulema Lourdes Flores-Salazar, Kimberly Dariela Arroyo-García, Rafael Soto-Gámez, Jessica Andrea Leal-Meléndez, Mauricio René Garza-Herrera, Gordon Bennett-Vidales, Mauricio Hurtado Cabrera, Roberto González-Habib, Liliann Peña Jiménez, Raúl Garza-Bulnes, Irene Antonieta Barco-Flores, Luis Fernando Castillo-Figueroa, Arnulfo Garza-Silva, Andrea Rivera-Cavazos, Diego Rivera-Salinas, Arnulfo González-Cantú, Miguel Ángel Sanz-Sánchez

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There is scarce information related to transplacental antibody transfer against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) with different homologous and heterologous vaccination schemes. This study aimed to correlate the magnitude of transplacental transfer anti-SARS-CoV-2 antibodies in different homologous and heterologous schemes. An observational cross-sectional study was developed to identify pregnant women vaccinated against SARS-CoV-2. They were questioned about their immunization status; blood samples from the mother, umbilical cord during labor, and the newborn 72 h after birth were taken to measure anti-S1 and anti-S2 specific IgG antibodies for SARS-CoV-2. We recruited 104 women with a median age of 29 (SD 1.17). We found antibodies in all newborns with vaccinated mothers. Homologous BNT162b2 mRNA regimen had the highest mean (SD) antibody titers (AU/mL) in maternal (994.93 (3.08), p = 0.039), umbilical cord (1316.43 (2.79), p = 0.016), and newborn (1192.02 (3.55), p = 0.020) blood. The generalized linear model showed a positive effect over antibodies with at least one dose in maternal (β = -1.1, p = 0.002) and newborn (β= -0.717, p = 0.044) blood, and with two doses (β = -0.684, p = 0.026) in umbilical cord blood. In conclusion, antibodies were detected in all vaccinated women and their newborns. Transfer of antibodies was found from the first dose, and the levels increased with the number of vaccine doses. Vaccination should be encouraged in pregnant women with any available scheme.

Original languageEnglish
Article number415
Issue number2
Publication statusPublished - 11 Feb 2023

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