This study is a retrospective, real world study, without any intervention in clinical diagnosis and treatment, and only real world data are collected for analysis.~The investigator will review symptoms, risk factors, and other non-invasive inclusion and exclusion criteria.~The study will collect and analyze available symptoms, risk factors and SARS-COV-2 Ct value up to 28 days.
The purpose of this retrospective study is to analyze real-world disease progression in mild-moderate COVID-19 patients with at least one risk factor for serve COVID-19 illness or death.