2.1 Participants
We
recruited
patients with laboratory-confirmed COVID-19 who admitted to the
designated hospitals in Qingdao from January 22 to February 14, 2020.
The detection of SARS-CoV-2 and other respiratory pathogens for all
patients were tested at the onset of COVID-19. Data were collected onto
standardized forms through interviews of infected persons.
Epidemiological, demographic, clinical, laboratory, treatment and
prognosis data were extracted from the interview as well as field
reports. All patients were diagnosed with COVID-19 according to New
Coronavirus Pneumonia Diagnosis and Treatment Plan (NHCPRC, 2020a;
NHCPRC, 2020b; NHCPRC, 2020c).
This study was approved by the Ethics Commission of Qingdao Municipal
Center for Disease Control and Prevention (Qingdao CDC) and written
informed consent was waived considering the emergency of infectious
disease.