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Wednesday, June 24, 2026

Fact check: No evidence Pfizer, Moderna COVID-19 vaccines cause miscarriage - USA TODAY

The claim: Miscarriage is among the 'tragic side effects' of mRNA vaccines

More than 400 million doses of the COVID-19 vaccines have been administered in the U.S., but some still have their doubts about its safety – particularly for pregnant people.

In a Dec. 8 online article, Joseph Mercola claimed miscarriage is among the "tragic side effects" of messenger RNA shots like those from Pfizer and Moderna.

"A troubling effect that isn’t getting the attention it deserves is miscarriage," the osteopathic physician wrote. "As of November 19, 2021, 3,071 miscarriages had been reported to the U.S. Vaccine Adverse Events Reporting System (VAERS)."

Mercola is one of the most influential spreaders of coronavirus misinformation online, The New York Times reported in July. He has previously promoted false claims about COVID-19 treatments and vaccines.

The Dec. 8 article racked up more than 1,300 shares on Facebook within one day, according to CrowdTangle, a social media insights tool. Mercola deletes content on his website 48 hours after publication, but copies of the article were shared on other websites.

USA TODAY has previously debunked claims that the COVID-19 vaccines pose a risk to pregnant people. This claim is similarly wrong.

"This is not correct," Dr. Denise Jamieson, chair of the Department of Gynecology & Obstetrics at the Emory University School of Medicine, said in an email. "There is reassuring evidence that the mRNA vaccines do not cause miscarriages."

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