Among 221 pregnancy-related adverse events reported to the VAERS, the most frequently reported event was spontaneous abortion (46 cases).ConclusionsPreliminary findings did not show obvious safety signals among pregnant persons who received mRNA Covid-19 vaccines. Although not directly comparable, calculated proportions of adverse pregnancy and neonatal outcomes in persons vaccinated against Covid-19 who had a completed pregnancy were similar to incidences reported in studies involving pregnant women that were conducted before the Covid-19 pandemic. Adverse neonatal outcomes included preterm birth (in 9.4%) and small size for gestational age (in 3.2%) no neonatal deaths were reported. Among 3958 participants enrolled in the v-safe pregnancy registry, 827 had a completed pregnancy, of which 115 (13.9%) resulted in a pregnancy loss and 712 (86.1%) resulted in a live birth (mostly among participants with vaccination in the third trimester). Injection-site pain was reported more frequently among pregnant persons than among nonpregnant women, whereas headache, myalgia, chills, and fever were reported less frequently. Meaney-Delman, Dana M.ĪbstractBackgroundMany pregnant persons in the United States are receiving messenger RNA (mRNA) coronavirus disease 2019 (Covid-19) vaccines, but data are limited on their safety in pregnancy.MethodsFrom December 14, 2020, to February 28, 2021, we used data from the “v-safe after vaccination health checker” surveillance system, the v-safe pregnancy registry, and the Vaccine Adverse Event Reporting System (VAERS) to characterize the initial safety of mRNA Covid-19 vaccines in pregnant persons.ResultsA total of 35,691 v-safe participants 16 to 54 years of age identified as pregnant. Alimchandani, Meghna Mba-Jonas, Adamma Martin, Stacey W. Oduyebo, Titilope Panagiotakopoulos, Lakshmi Marquez, Paige L. Preliminary Findings of mRNA Covid-19 Vaccine Safety in Pregnant Persons Preliminary Findings of mRNA Covid-19 Vaccine Safety in Pregnant Persons
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