Patients
Sixty-two Chinese patients with COVID-19, from the First Hospital of Hunan University of Chinese Medicine and Loudi Center for Diseases Prevention and Control, who met the diagnostic criteria for COVID-19 and the requirements of the treatment plan (trial version 6) issued by the Health Commission of the People’s Republic of China[9], were included in the study as the infected group. A total of 131 cases from the First Hospital of Hunan University of Chinese Medicine, including 67 healthy individuals and 64 non- COVID-19 inpatients, served as the non-infected group. This study was approved by Ethics Committee of the First Hospital of Hunan University of Chinese Medicine, with an informed consent of patients and their families.