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High levels of antibodies passed from vaccinated pregnant women to babies

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eMediNexus    26 September 2021

A new study suggests that pregnant women who receive an mRNA COVID-19 vaccine pass high levels of protective antibodies to their babies.

Investigators assessed umbilical cord blood from 36 newborns whose mothers had been administered at least one dose of Pfizer/BioNTech or Moderna COVID-19 vaccine. All 36 newborns were found to have high levels of antibodies known to target the spike protein. All the antibodies could be traced to the mothers’ vaccinations. The findings thus suggest that the antibodies that the mother develops following vaccination cross the placenta and likely confer benefits for the infant after birth, stated study coauthor Dr. Ashley Roman, NYU Langone Health, New York City. However, it is not known if the timing of vaccination during pregnancy is tied to antibody levels in the baby. It is also not clear as to how long these antibodies persist in the baby.

The findings are published in the American Journal of Obstetrics and Gynecology - Maternal Fetal Medicine… (Reuters, September 25, 2021)

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