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Do mRNA vaccines cause blood clots?

The Claim:

The Canadian former oncologist is again making claims about the harms of vaccines. This time, he is claiming that pro-athletes, such as Deion Sanders, are suffering from blood clots and “micro clots” caused by mRNA COVID vaccines.

The Facts:

Deion Sanders experienced blood clots in 2021, which led to the amputation of two toes. If you believe the tweet, it was all due to the mRNA COVID vaccines he received months before. According to his doctors, however, those clots were due to one of the most common causes of blood clots, a prior surgery on his foot.

If you examine the tweet closely, the second image of blood clots is used to prove the blood clot risk of mRNA vaccines. Yet right there in the caption, we read that those clots were due to COVID infection itself, something he had prior to his first vaccine.
Anti-vaccine activists have used prior concerns about a particular type of blood clot associated with adenovirus vector vaccines. mRNA vaccines, like Pfizer-BioNTech and Moderna, have a minimal risk of blood clots, unlike COVID itself, which significantly increases the risk of blood clots and stroke.

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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