A major study analyzing health records from nearly 46 million adults has found that the risk of heart attacks and strokes decreased following COVID-19 vaccinations—directly challenging widespread misinformation.
Published in Nature Communications, the research tracked individuals from December 2020 to January 2022 and found a 10% reduction in arterial thromboses (such as heart attacks and strokes) after the first vaccine dose. The protective effects were even stronger after second doses and boosters, with a 20% drop for Pfizer/BioNTech recipients and a 27% reduction among those who received AstraZeneca.
While the study acknowledged rare risks, including myocarditis and clotting issues—mainly in the weeks immediately after vaccination—these events were extremely uncommon.
In contrast, contracting COVID-19 significantly increased the risk of serious cardiovascular complications. Co-author Dr. Samantha Ip emphasized that the findings offer robust support for the safety and long-term health benefits of COVID-19 vaccines.
As misinformation continues to circulate online, this study adds to a growing body of evidence showing that the vaccines don’t just protect against infection—they may also reduce the risk of some of the deadliest health emergencies.
Source: Ip, S., et al.. COVID-19 vaccination and risk of arterial and venous thrombotic events in 45.7 million adults. Nature Communications
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