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Pregnant Women Who Receive COVID-19 mRNA Vaccines Pass Antibodies to Their Babies

A pregnant woman at the doctors. Credit: Shutterstock Women who receive COVID-19 mRNA vaccines produced by Pfizer-BioNTech or Moderna while in their third trimester of pregnancy generate a strong immune response and pass protective antibodies through umbilical cord blood to their babies, according to a study conducted by Weill Cornell Medicine and NewYork-Presbyterian researchers, published April 28 in Obstetrics & Gynecology. Researchers studied 122 women who received the two-dose Pfizer or Moderna mRNA vaccine during pregnancy and analyzed the antibody response mounted upon vaccination. They also assessed the presence of antibodies in the cord blood of babies born to these women at the time of birth. The research demonstrated that 99 percent of newborns had protective antibodies after their mothers received both vaccine doses, and 44 percent of babies had antibodies after one dose. 

Vaccinated pregnant women pass antibodies to their babies

April 29, 2021 Women who receive COVID-19 mRNA vaccines produced by Pfizer-BioNTech or Moderna while in their third trimester of pregnancy generate a strong immune response and pass protective antibodies through umbilical cord blood to their babies, according to a study conducted by Weill Cornell Medicine and NewYork-Presbyterian researchers, published April 28 in Obstetrics & Gynecology. Researchers studied 122 women who received the two-dose Pfizer or Moderna mRNA vaccine during pregnancy and analyzed the antibody response mounted upon vaccination. They also assessed the presence of antibodies in the cord blood of babies born to these women at the time of birth. The research demonstrated that 99% of newborns had protective antibodies after their mothers received both vaccine doses, and 44% of babies had antibodies after one dose. 

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