Since the 21st century, the world has experienced a variety of epidemic diseases, causing huge losses to the human, material and financial resources of many countries. Based on the analysis of domestic and foreign literature, this paper makes a systematic review and comparative analysis of the epidemiological, clinical and imaging characteristics of COVID-19 and Severe Acute Respiratory Syndrome (SARS), and summarizes the similarities and differences of their symptoms, so as to provide reference for the global medical staff to scientifically prevent and control the epidemic.

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