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HealthPartners Institute research published in the New England Journal of Medicine affirms that COVID-19 vaccines are safe for people who are pregnant

New data should increase confidence in vaccine safety among people who are pregnant and more at-risk for COVID-19 complications

June 23, 2022

Bloomington, Minn. – New research published in the New England Journal of Medicine found that COVID-19 vaccinations during pregnancy were not associated with increased risk of serious acute adverse events, such as blood clots, low platelets, or other serious conditions. The study led by HealthPartners Institute supports a growing body of data that shows the vaccines are safe for people who are pregnant.

“If there are people who are hesitant to get vaccinated because they’re pregnant or thinking about getting pregnant, this data will hopefully reassure them that the COVID-19 vaccines are safe,” said Malini DeSilva, MD, researcher with HealthPartners Institute and lead author on the study. “It’s important that pregnant people are protected against the virus, because they’re at higher risk of serious complications.”

The researchers analyzed data from more than 45,000 people who received COVID-19 vaccinations during pregnancy or in the 28 days preceding pregnancy. The vaccinations occurred between Dec. 15, 2020 and July 1, 2021 and included the three COVID-19 vaccines currently approved for use in the U.S. Most people in the study received two doses of an mRNA vaccine.

The vaccinations were associated with minor reactions like malaise, fever and other well-documented side effects. But, they did not cause serious adverse events such as anaphylaxis or other cardiac, hematologic, inflammatory, neurologic, and rheumatologic reactions.

By comparison, other studies have shown that people who are pregnant and infected with COVID-19 have an increased risk of hospitalizations and death. Some data also suggest that the virus can lead to stillbirth.

This work was done in collaboration with eight large health systems across the nation including HealthPartners. These health systems make up the Vaccine Safety Datalink, which conducts post-market vaccine surveillance projects in partnership with the CDC, a particularly important area of research because COVID-19 vaccines did not include pregnant people during clinical trials.

“There was some understandable hesitation among those who were pregnant when vaccines first came to market because we didn’t have much data for this group of people,” DeSilva said. “But with this study, and other studies that have looked at COVID-19 vaccinations and pregnancy, we can be more sure that they’re safe and provide important protection for parent and baby.”

About HealthPartners Institute

HealthPartners Institute is part of HealthPartners, the largest consumer governed nonprofit health care organization in the nation with a mission to improve health and well-being in partnership with our members, patients and the community. HealthPartners Institute supports this mission through research and education—advancing care delivery and public health around the globe. The Institute annually conducts more than 350 research studies and trains 700+ medical residents and fellows and 1,200+ medical and advanced practice students. Its integration with HealthPartners’ hospitals, clinics and health plan strengthens the Institute’s ability to discover and develop evidence-based solutions and translate them into practice. Visit for more information.

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