Data collection
The information collected for COVID-19 patients included demographic
characteristics (age, sex and continent), comorbidities (hypertension,
diabetes, etc.), drug therapy, severity, clinical symptoms (fever, dry
cough, expectoration, myalgia, diarrhea, shortness of breath, fatigue,
etc.), radiological examinations (CT), and blood examinations
(white
blood cell count, lymphocyte cell count and lymphocyte cell percentage)
at the first admission. The second admission information of positive
retest patients was also collected. The information collected for close
contacts included demographic characteristics, quarantine site (health
care facilities and home), frequency of contact (often, moderate, and
occasional), and contact modes (household, public transportation, health
care settings, workplaces, and entertainment places).