No safety signals in pregnant women who got mRNA COVID vaccinesPreliminary findings from a large analysis of pregnant women who received mRNA COVID-19 vaccines showed no obvious safety signals, Centers for Disease Control and Prevention (CDC) researchers reported yesterday in the New England Journal of Medicine.Using data voluntarily reported to three US vaccine safety monitoring systems—the "v-safe after vaccination health checker" surveillance system, the v-safe pregnancy registry, and the Vaccine Adverse Event Reporting System (VAERS)—the researchers examined outcomes among 35,691 pregnant women who received either the Pfizer/BioNTech or Moderna vaccines from Dec 14, 2020 through Feb 28.