Study Links COVID-19 Vaccine to Lower Preeclampsia Risk
A new clinical study from the University of Oxford found that COVID-19 vaccination during pregnancy may lower the risk of preeclampsia. Researchers observed a statistically significant reduction in preeclampsia rates among a large cohort of vaccinated pregnant women compared to unvaccinated peers. The findings suggest a potential protective mechanism beyond infection control for a leading cause of maternal morbidity.
- The multinational study, conducted by the INTERCOVID Consortium and led by University of Oxford researchers, analyzed data from 6,527 pregnant women across 18 countries between 2020 and 2022. - Previous research established a strong link between SARS-CoV-2 infection and preeclampsia, with one systematic review finding that infection during pregnancy was associated with 62% higher odds of developing the condition. The Oxford study specifically found that COVID-19 infection was linked to a 45% increased risk of preeclampsia, which rose to 78% among unvaccinated women. - The protective effect of the vaccine was most significant in those who had received a booster dose, which was associated with a 33% reduction in the overall odds of developing preeclampsia. - For pregnant women with pre-existing health conditions such as diabetes or chronic hypertension, vaccination including a booster dose was linked to a 58% reduction in preeclampsia risk. - Preeclampsia is understood to be a two-stage disorder that begins with abnormal placental development and leads to widespread maternal endothelial dysfunction. Researchers theorize the vaccine may provide a broader immunological or vascular benefit that influences these pathways beyond just preventing severe COVID-19. - The American College of Obstetricians and Gynecologists (ACOG) recommends that all pregnant individuals receive an updated COVID-19 vaccine, which can be administered in any trimester. Their guidance is based on extensive data confirming the vaccine's safety and its effectiveness in reducing the risk of severe illness and adverse pregnancy outcomes like preterm birth and stillbirth.
