Background:Severe acute respiratory syndrome coronavirus 2 (SARS CoV-2) is responsible for the current coronavirus disease 2019 (COVID-19) pandemic that has affected more than 170 million people worldwide.The etiology and pathophysiology of long COVID still needs to be clearly defined. Patients with long COVID present with prolonged multisystem involvement and significant disability.To understand better the long-term course and etiology of symptoms, we analyzed a cohort of patients with COVID-19 prospectively. The subjects were followed up at 3,6 and 12 months after discharge from the hospital.