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SINGAPORE - People who have recovered from Covid-19, regardless of the severity of their disease, may be at risk of developing blood clots due to an overactive immune system, according to a study by local scientists. Blood clots in major arteries, especially those which are linked to vital organs, can increase a person s risk of heart attack, stroke or organ failure. Blood samples from 30 patients who had recovered from mild, moderate and severe Covid-19 were collected a month after they had been discharged from the hospital. All of them were found to have blood vessel damage, possibly arising from a lingering immune response, which could trigger the formation of blood clots.

Florence chiohChristine cheungNational centre of infectious diseasesAgency for scienceTan tock seng hospital department of haematologyLee kong chian school of medicineResearcha star singapore immunology networkAssistant professor christine cheungNanyang technological universityLee kong chian schoolProf cheungSingapore immunology networkNational centreInfectious diseasesTan tock seng hospitalJournal of thrombosis and thrombolysis