COVACPREG, a French prospective cohort study of women vaccinated against COVID-19 during pregnancy

The objective of this cohort study was to describe the French population of pregnant women vaccinated against coronavirus disease 2019 (COVID-19), their pregnancy outcomes and the health status of their newborns (malformation rate, neonatal diseases, etc.), and to proactively collect and analyze reported adverse reactions over time. We conducted a prospective study using an online questionnaire. Women vaccinated during pregnancy who wanted to participate were asked to complete an inclusion questionnaire (dates of pregnancy and vaccination COVID-19, etc.), a questionnaire on the potential occurrence of adverse reactions (time of onset, type of adverse reaction, etc.) of the vaccination, sent 1 month after the injection, and a final questionnaire on the outcome of the pregnancy and the health status of the child. A total of 938 women were prospectively included in this first French study. A total of 132 women reported having had at least 1 adverse reaction following vaccination during pregnancy (14.1%), including few 'serious' adverse reaction (5.3%). There were no signals of adverse reactions during continuous monitoring. Among the 938 pregnant women, 22.4% received the vaccination COVID-19 during the first trimester, 64.2% during the second and 33.4% during the third trimester (some women have had several injections in different trimesters). Among the 938 women, 4.3% developed gestational hypertension and 13.9% diabetes; 3.3% had intrauterine growth restriction and 7.8% threatened preterm delivery. These rates are comparable to those observed in the French general population. Among live births, the rate of preterm birth was 5.1%. We reported a prevalence of major malformations of 3.9%, which is comparable to that reported by European Surveillance of Congenital Anomalies (EUROCAT), with a rate of 3.5% of major malformations in the general population of mainland France. In conclusion, our study did not demonstrate any particular safety signals in the event of vaccination with a Covid-19 vaccine during pregnancy.