The False Narrative
A July 2023 Swiss study showed that the Moderna COVID-19 vaccine caused heart damage in 1 in 35 recipients.
Variations of this False Narrative
- A July 2023 Swiss study found that heart injuries from the COVID-19 vaccine occurred 3,000 times more often than the U.S Centers for Disease Control and Prevention (CDC) claimed.
The Facts
This claim was based on misstating the results of a study published in the peer-reviewed European Journal of Heart Failure in July 2023.
The study tested levels of troponin T, a protein in heart muscle cells which, when found in the blood, could indicate damage to the heart muscle, according to a March 2022 article on the Cleveland Clinic’s website. The researchers found that 2.8 percent of 777 hospital workers — or 1 in 35 of the study’s population — had elevated troponin T levels three days after receiving a third dose of the Moderna COVID-19 vaccine.
However, the study also said that none of the study participants showed changes on electrocardiograms, which is a test that measures the heart’s electrical activity, and that no patients had what the study called “major adverse cardiac events,” such as a stroke or heart attack, within 30 days. The study also did not find a definitive case of myocarditis, or inflammation of the heart muscle, which is a rare side effect associated with Pfizer and Moderna’s COVID-19 vaccines.
Moreover, the study said that the elevated troponin T levels it identified were “mild.” Dr. James de Lemos, a cardiologist at the University of Texas Southwestern Medical Center in Dallas who was not involved in the study, told fact-checking site Lead Stories in July 2023 that the levels of troponin T found in the participants were “trivial,” and that “these small troponin elevations are not likely events of clinical significance.”
Similarly, Dr. Nicholas Mills, a professor of cardiology at the University of Edinburgh who studies troponin, told FactCheck.org in August 2023, “These increases in cardiac troponin are not clinically significant and would not be associated with any quantifiable effect on the heart using imaging.”
One variation of this claim compared the July 2023 study to an October 2022 study published in the European Journal of Heart Failure that was shared on the CDC’s website.
However, those studies were measuring different types of outcomes. The October 2022 study found that myocarditis cases confirmed to have been caused by COVID-19 vaccines occurred in one out of 100,000 doses, or 0.001 percent. As explained above, the July 2023 study focused on how many study participants had elevated levels of troponin T, and that research found “no definitive cases of myocarditis” among its 777 participants.
Nevertheless, a July 26, 2023, InfoWars article titled “Heart Injuries From COVID Vaccine 3000x Higher Than CDC Admits, Study Finds,” presented the two studies as if they were measuring the same outcome. “A disturbing study out of Switzerland found that the incidence of cardiac-related injuries following the COVID jab was 3000x higher than U.S. government figures,” comparing the 2.8 percent of people in the July 2023 study who had elevated troponin T levels to the 0.001 percent figure of actual myocarditis cases found in the October 2022 study.
How the False Narrative Emerged
The claim that the Moderna COVID-19 vaccine caused heart damage in 1 in 35 recipients first appeared in a July 26, 2023, YouTube video from Dr. John Campbell, a former nurse educator and a regular purveyor of misinformation about the safety of COVID-19 vaccines.
In the video, Campbell stated: “After Moderna booster vaccines in a trial done in Switzerland, there were 777 working people followed up with 777 controls. Five-point-one percent of those who had the booster vaccine had increased troponins, indicating cardiomyocyte damage.” He continued: “So, 5.1 percent increased cardiac marker damage chemical in the blood. Two-point-eight percent of the 777, that’s one in 35, one in 35, had vaccine-associated myocardial injury. Quite astounding and incredible.”
As of Aug. 16, 2023, the video had been viewed more than 1.2 million times.
Where the False Narrative Spread
The claim spread on sites with low NewsGuard Trust Scores, including TheGatewayPundit.com, InfoWars.com, and NaturalNews.com.
For example, a July 27, 2023, Gateway Pundit article titled “KILL SHOT: Recent Peer-Reviewed Report Finds 1 in 35 People Who Took Moderna COVID Shot Had Signs of Heart Damage,” stated: “A new study from the European Journal of Heart Failure found that 1 in 35 people showed signs of heart damage after taking the Moderna COVID19 vaccine.”
The claim also spread on social media sites including Instagram and X, formerly known as Twitter.
“DiedSuddenly,” a verified X account known for spreading false claims about COVID-19 mRNA vaccines, shared a video with its approximately 491,000 followers on Aug. 7, 2023, in which Australian Senator Malcolm Roberts of the right-wing One Nation Party referenced the study. In a speech in the Australian Senate, Roberts stated: “1 in 35 recipients of a Moderna Covid booster experienced Myocarditis.” As of Aug. 16, 2023, the post had been liked 15,500 times and reposted 7,600 times.
Background
The Swiss study itself noted that “COVID-19 [infection] associates with a substantially higher risk for myocarditis than mRNA vaccination, and myocarditis related to COVID-19 infection has shown a higher mortality than myocarditis related to mRNA-vaccination.”
The study also said, “Even among males aged 12–17 years, the group with the highest incidence of cardiac complications after receipt of a second mRNA COVID-19 vaccine dose, the risk was 1.8 – 5.6 times as high after SARS-CoV-2 infection than after vaccination.”