Being infected with Covid-19 increases the risk of blood clots, even a year later

Last April, a Swedish study suggested that Covid-19 increased the risk of deep vein thrombosis (a blood clot in the leg) up to three months after infection, pulmonary embolism (a blood clot in the lungs) up to six months later and a bleeding event up to two months later. According to the researchers, the risk would also be higher in patients with comorbidities or those who have experienced a severe form of the disease.

A new study, conducted with Covid-19 infection, increases the risk of life-threatening blood clots for at least 49 weeks after infection. The authors of this study, published in the journal Circulation, suggest that the pandemic may have led to an additional 10,500 cases of heart attacks, strokes and other blood clot complications, such as deep vein thrombosis, in England and Wales alone.

Most previous studies have investigated the impact of covid on blood clotting in hospitalized people. The new study shows that there was also an effect in people whose Covid infection had not led to hospitalization.

The importance of vaccination to prevent blood clots

For researchers, these results first show the importance of taking action, in particular (…)


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