Researchers Warn Against mRNA COVID Vaccine Use in Pregnancy

( After re-analyzing a study performed by Centers for Disease Control and Prevention researchers, two New Zealand researchers are suggesting that countries should halt COVID vaccinations for pregnant and breastfeeding women.

The CDC-cited study, published in April in the New England Journal of Medicine, has been used by the CDC and health agencies worldwide to justify recommending the COVID vaccine to pregnant women and new mothers.

The study was corrected last month after concerns were raised by a Belgian researcher. CDC scientists acknowledged they should have made it clear that they were unable to accurately calculate a risk estimate for miscarriages because no follow-up data were available.

According to Dr. Simon Thornley, a senior lecturer in the University of Auckland’s Section of Epidemiology and Biostatistics, and Dr. Aleisha Brock, another researcher from New Zealand, while the correction resolved some of the issues with the study, there are still concerns.

Of the 827 pregnancies reported through the V-Safe registry, operated by the CDC, 712 resulted in a live birth. Nearly all of them were among women who were vaccinated in the third trimester. Of the other pregnancies, 104 resulted in miscarriage, most of which occurred during the first trimester.

Using data from the study and several estimates, Thornley and Brock calculated that spontaneous abortions occurred in 81.9 percent to 91.2 percent of the women vaccinated before 20 weeks of gestation.

They concluded that, when used in the first and second trimesters, evidence of the vaccine’s safety cannot be established “until these cohorts have been followed to at least the perinatal period,” or until the long-term safety of the babies born to vaccinated mothers can be determined.

On its labeling, Pfizer concedes that the available data on vaccines administered to pregnant women “are insufficient to inform vaccine-associated risks in pregnancy.”

The CDC is recommending pregnant women get a COVID-19 vaccine, with few exceptions. But Thornley is not convinced. He said while the study shows no increased risk from the vaccine, the study is in no way conclusive.

Thornley believes that since the risk of severe illness or fatality from COVID is “generally extremely low” among younger people, including those who are pregnant, he would caution against vaccination, “given the substantial uncertainty that exists.”