Two studies published Wednesday show Covid-19 vaccines do not increase the risk of miscarriage for pregnant women.
A team at the US Centers for Disease Control and Prevention studied data from the agency’s v-safe vaccine safety reporting program covering more than 2,000 pregnant women who got vaccinated. They found no higher risk among these women than for pregnant women in general. Miscarriages are common – between 11% and 22% of all recognized pregnancies end in miscarriages before 20 weeks of gestation, they said. This rate did not go up among vaccinated women, they found.
“These findings add to the accumulating evidence about the safety of mRNA Covid-19 vaccination in pregnancy,” Lauren Zauche of the CDC’s National Center on Birth Defects and Developmental Disabilities wrote in a letter to the New England Journal of Medicine.
In a second letter to the Journal of the American Medical Association, Dr. Elyse Kharbanda of HealthPartners Institute in Minneapolis and colleagues said they looked at different CDC data and came to the same conclusion – Covid-19 vaccines do not raise the risk of miscarriage.
They looked at data from eight health systems across the US covering 105,000 pregnancies through June. Those women who suffered miscarriages were no more likely to have been vaccinated, they found. The findings were the same whether women got Pfizer’s or Moderna’s vaccine. Too few pregnant women got the Johnson & Johnson vaccine to be able to assess the risk, they said.
The CDC has urged pregnant people to get vaccinated.