Three-quarters of Covid-19 patients still have at least one symptom six months after first falling ill, researchers who followed hospital patients in China reported Friday. … Almost two-thirds of the patients said they were still suffering from fatigue and muscle weakness, the researchers wrote in The Lancet. A little over a quarter had difficulty sleeping, and a little under a quarter experienced anxiety and depression. Overall, more women than men reported lingering symptoms, and people whose disease was more severe had poorer lung health. Their median age was 57.