Vaccine Pregnancy Study Data Manipulated to Indicate High Miscarriage Risk

Manipulated data from the preliminary findings of a CDC study investigating  COVID-19 vaccines and pregnancy outcomes are being used to claim that the vaccines are harmful to pregnant women. The study enrolled 3,958 women around three months after vaccination. Of the 827 pregnancies evaluated, the researchers found a miscarriage rate of 12.6 percent (104 pregnancies) which is comparable to the average miscarriage rate of 10 to 20 percent. Importantly, this data only includes data from completed pregnancies, which means more data is available for people who were vaccinated later in their pregnancy than for people vaccinated earlier in their pregnancy. Following the publication of the results in the New England Journal of Medicine, social media users noted that 700 of the pregnancies included in the analysis were vaccinated after 20 weeks when the risk of miscarriage is lower. They then re-calculated the rate to include only pregnancies with vaccination during the first trimester, concluding that the real miscarriage rate is 82 percent. This is a gross misrepresentation of the study’s data, as it fails to include complete data from the people who were vaccinated prior to 20 weeks, most of whom are still pregnant. In fact, the study explicitly states that “whereas some pregnancies with vaccination in the first and early second trimester have been completed, the majority are ongoing.”  By only including data from those who were vaccinated early in their pregnancy, the results were primarily from pregnancies that ended early, due to premature birth or miscarriage. The results presented in the study are preliminary and data is still being collected. At this time, the results suggest that there is no increased risk of miscarriage following COVID-19 vaccination.

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The Public Health Communications Collaborative (PHCC) was formed in 2020 to coordinate and amplify public health messaging on COVID-19 and increase Americans’ confidence in guidance from the Centers for Disease Control and Prevention (CDC) and state and local public health officials.

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