Covid: An infection increases the risk of venous thrombosis up to 6 months after contamination

It was already known that Covid-19 increases the risk of blood clots better known as venous thrombosis, but the duration during which this risk was increased was not yet known. A Swedish study provides a better understanding of this public health issue.

A Swedish study reveals this Thursday an increased risk of deep vein thrombosis (a blood clot in the leg) up to three months after infection with Covid-19, pulmonary embolism (a blood clot in the lungs) until six months later and a bleeding event up to two months later.

This risk is higher in patients with comorbidities and those with severe Covid-19.

The findings, published in the British Medical Journal on Thursday, could help explain the doubling of incidence and death from blood clots in England since the start of the pandemic compared to the same periods in 2018 and 2019.https://

—BeeMarie (@beemaristanley) April 7, 2022

According to the elements provided by the researchers, relayed by AFP, more than one million people in Sweden having been infected with SARS-Cov2 between February 1, 2020 and May 25, 2021, matched by age, sex and place of residence to more than four million people who had not tested positive for Covid.

The scientists were able to determine the rates of deep vein thrombosis, pulmonary embolism and bleeding in people who had Covid-19 during a control period and made comparisons with a control group.

For the researchers, these results justify the taking of measures aimed at preventing thrombotic events (such as the administration of treatments which prevent the formation of a clot in the blood vessels), in particular for patients at high risk, and reinforce the importance of vaccination against Covid-19.

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