No Adverse Effect of mRNA Shot for Pregnant Women, Newborns

(Reuters) – COVID-19 vaccination during pregnancy with mRNA shots, such as those from Moderna or Pfizer and BioNTech, does not appear to cause problems for women or their newborns, according to two studies published in JAMA.

One study of 157,521 pregnancies, conducted in Scandinavia, found no significant links between the vaccines – mostly given during the second or third trimester – and pregnancy problems.

The other study involved 97,590 women in Canada, including 22,660 who received at least one dose of a vaccine during pregnancy and 44,815 who were vaccinated after pregnancy. Vaccination during pregnancy, compared with after pregnancy and with no vaccination, was not significantly associated with childbirth complications for mothers or babies.

An editorial published with the two reports calls for similar research in countries where other types of COVID-19 vaccines are more commonly used in pregnancy.

SOURCE:, and JAMA, online March 24, 2022.

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