You’re more at risk for blood clots after you’ve contracted COVID-19 than you are if you’ve been vaccinated against COVID-19, a new study suggested.

Do you get blood clots from COVID-19 or the COVID-19 vaccine?

The study — which has been peer-reviewed and published in the British Medical Journal — compared rates of rare blood clotting after a first vaccination dose and after a positive COVID-19 test.

  • The study analyzed more than 29 million people who had received their first dose of the Oxford-AstraZeneca vaccine and the Pfizer-BioNTech vaccine.
First case of rare blood-clotting condition linked to J&J vaccine diagnosed in Utah

In all, the researchers found the risk of these rare blood events were “substantially higher” after COVID-19 infection compared to when you’ve been vaccinated, per CNBC.

  • Just 66 people per 10 million were hospitalized or died from blood clots within 28 days after getting the vaccine.
  • Whereas 12,614 people per 10 million suffered the same situation after testing positive for COVID-19.

Blood clots and the COVID-19 vaccine

There has been ongoing concerns that the COVID-19 vaccine leads to blood clots, and the research has been mixed. For example, The Wall Street Journal reported that the AstraZeneca COVID-19 vaccine has been linked to blood clots because it can “trigger an autoimmune disorder causing blood to clot in the brain, which would offer an explanation for isolated incidents across Europe in recent weeks,” The Wall Street Journal reports.

Why is the AstraZeneca vaccine linked to blood clots? Scientists may have found the answer

Similarly, the Johnson & Johnson COVID-19 vaccine was paused because six people were linked to blood clots, as the Deseret News reported. In all, those six cases were among women and were of the 6.8 million doses of the Johnson & Johnson vaccine that had been administered at the time. Weeks later, the ban on J&J’s vaccine was lifted.

Experts haven’t been worried about blood clots caused by the Moderna or Pfizer mRNA vaccines, though.

Dr. Vivek Cherian, an internal medicine physician in Baltimore, told Insider that there’s no reason for people to worry since Pfizer and Moderna use a different technology — the mRNA — for their vaccines.

  • “Instead of taking away confidence from other vaccines, this should actually inspire further confidence in the oversight of these vaccines and definitely should not deter individuals scheduled for either Pfizer and Moderna vaccines to go through with their appointments,” Cherian said.