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To investigate the Computed Tomography (CT) imaging characteristics and dynamic changes of COVID-19 pneumonia at different stages. Forty-six patients infected with COVID-19 who had chest CT scans were enrolled, and CT scans were performed 4-6 times with an interval of 2-5 days. At the early stage (n=25), ground glass opacity was presented in 11 patients (11/25 or 44.0%) and ground glass opacity mixed with consolidation in 13 (13/25 or 52.0%) in the lung CT images. At the progressive stage (n=38), ground glass opacity was presented in only