A group of doctors in Japan has discovered that neutralizing antibodies against the coronavirus are transferred from pregnant women who received two vaccine doses to the fetus.
The doctors at the National Mie Hospital led by Suga Shigeru analyzed the umbilical cord blood of 146 women. They compared it with their blood after they gave birth.
The mothers had received two doses of the Pfizer vaccine.
They say that the level of neutralizing antibodies in the umbilical cord blood was 68 percent higher than the level in the mother's blood.
The doctors say they confirmed that the antibodies created by the vaccines in them were transferred to the fetus across the placenta.
The research also shows that women who received a second vaccine shot between 28 weeks and 34 weeks into pregnancy had the highest level of antibodies in the cord blood.
The doctors say, however, women who received the second vaccine dose earlier or later in pregnancy showed a certain high level of antibody transfer.
Suga said he recommends that pregnant women consider getting vaccinated for themselves and their babies.