WASHINGTON: COVID-19 survivors have twice the risk of developing dangerous blood clots that travel to their lungs compared to people who were not infected, as well double the chance of respiratory symptoms, a large new study said on Tuesday (May 24).

The research by the Centers for Disease Control and Prevention (CDC) found that as many as one in five adults aged 18 to 64 and one in four of those over 65 went on to experience health conditions that could be related to their bout of COVID-19 - a finding consistent with other research.

Among all conditions, the risk of developing acute pulmonary embolism - a clot in an artery of the lung - increased the most, by a factor of two in both adults younger and older than 65, as did respiratory symptoms like a chronic cough or shortness of breath.

Pulmonary embolisms usually travel to the lungs from a deep vein in the legs, and can cause serious problems, including lung damage, low oxygen levels and death.

The study was based on more than 350,000 patient records of people who had COVID-19 from March 2020 to November 2021, paired with 1.6 million people in a "control" group who had sought medical attention in the same month as a corresponding "case" patient, but weren't diagnosed with COVID-19.

The team assessed the records for the occurrence of 26 clinical conditions previously associated with long COVID-19.

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