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New Research Warns Of Higher Risk of Blood Clot after COVID Infection

After a COVID infection, there is an increased risk of developing a serious blood clot for the next six months, a study from Sweden suggests.

The research found people with severe COVID, and those infected during the first wave, had the highest clot risk.

The researchers tracked the health of just over one million people who tested positive for COVID between February 2020 and May 2021 in Sweden, and compared them with four million people of the same age and sex who had not had a positive test.

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After a COVID infection, they found an increased risk of:

  • Blood clots in the leg, or Deep Vein Thrombosis (DVT) for up to three months.
  • Blood clots in the lungs, or pulmonary embolism, for up to six months.
  • Internal bleeding, such as a stroke, for up to two months.

When the researchers compared the risks of blood clots after COVID to the normal level of risk, they found that:

  • Four in every 10,000 COVID patients developed DVT compared with one in every 10,000 people who didn’t have COVID.
  • About 17 in every 10,000 COVID patients had a blood clot in the lung compared with fewer than one in every 10,000 who did not have COVID.

The study, published in the BMJ, said the raised risk of blood clots was higher in the first wave than later waves, probably because treatments improved during the pandemic and older patients were starting to be vaccinated by the second wave.

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