A study of tens of thousands of people in Scotland found that one in 20 people who had been sick with Covid reported not recovering at all, and another four in 10 said they had not fully recovered from their infections many months later.
The authors of the study, published on Wednesday in the journal Nature Communications, tried to home in on the long-term risks of Covid by comparing the frequency of symptoms in people with and without previous Covid diagnoses.
People with previous symptomatic Covid infections reported certain persistent symptoms, such as breathlessness, palpitations and confusion or difficulty concentrating, at a rate roughly three times as high as uninfected people in surveys from six to 18 months later, the study found. Those patients also experienced elevated risks of more than 20 other symptoms relating to the heart, respiratory health, muscle aches, mental health and the sensory system.