Study finds long-haul COVID-19 common, in even those with mild disease Long-haul COVID-19 was associated with severe or very severe symptoms, low income, and some age-groups, but was common even in those with mild symptoms, with a quarter of patients in that group having symptoms after 60 days, according to a Clinical Infectious Diseases study today that looked at adult Michigan patients. The researchers surveyed 593 Michigan adults who had a symptomatic COVID-19 diagnosis through mid-April 2020. Most were female (56.1%), older than 45 years (68.2%), and either White (46.3%) or Black (34.8%). More than half reported 30-day COVID-19 symptoms (52.5%), and 35.0% said they had symptoms 60 days post-diagnosis. The most common symptoms among 60-day COVID-19 patients were fatigue (52.9%) and shortness of breath (43.9%).