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Do COVID vaccines cause heart failure?

The Claim:

A case study is being used by anti-vaxxers to claim that using endomyocardial biopsy (EMB) reveals COVID vaccines are causing fatal heart failure. 

The Facts:

To the best of our knowledge, this is the first reported case of biopsy-proven iDCM following mRNA-1273 immunization.

The report acknowledges that it has some limitations. First, the researchers couldn’t completely rule out the possibility that the patient had a COVID infection, which might have contributed to her symptoms. Second, they point out that the tests used to diagnose heart inflammation (myocarditis) aren’t always precise or reliable, meaning that some cases might be missed or incorrectly identified. These limitations highlight the challenges in making a definitive diagnosis.

Additionally, the woman was treated and was stable at follow up with no recurrences a year later. To claim that the case report proves that “fatal cases of heart failures to surge throughout the globe” because of COVID vaccines is false.

COVID infection itself can cause heart failure or heart attack. Rates of heart disease surged starting in the year 2020, before COVID vaccines were available.

Disclaimer: Science is always evolving and our understanding of these topics may have evolved too since this was originally posted. Be sure to check out our most recent posts and browse the latest Just the Facts Topics for the latest.

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