The study found that women who received mRNA injections during early pregnancy experienced significantly higher rates of miscarriage and fetal loss than expected. The researchers found a staggering 43% increase in fetal loss rates for women vaccinated in weeks 8–13 of pregnancy after their first Covid shot.

The study is based on electronic health records (EHR) from one of Israel’s largest health insurance providers. The data showed that nearly half of the excess fetal losses occurred after week 24 of gestation, a stage where abortions are extremely rare in Israel and must be medically justified. This, researchers say, points to a biological mechanism, not a behavioral one.

The study was led by Dr. Josh Guetzkow, a senior lecturer in criminology and sociology at Israel’s Hebrew University of Jerusalem. Guetzkow’s team of researchers includes top advisers to President Donald Trump’s Food and Drug Administration (FDA) and Centers for Disease Control and Prevention (CDC). The results of the study were published in the medRxiv journal, at: https://www.medrxiv.org/content/10.1101/2025.06.18.25329352v1