Coronavirus Disease 2019 (COVID-19) outbreak in Wuhan, China, spread rapidly throughout China, and gradually to some countries abroad. How to control the development of the epidemic? Early diagnosis is one of the important contents in prevention and control. COVID-19 patients with early mild pneumonia often lack typical evidence to make a definitive diagnosis. Based on the analysis of the cases of 4 patients, this article finds that early diagnosis requires a combination of epidemiology, clinical manifestations, imaging, and etiology, with particular emphasis on epidemiology history and chest CT manifestations.
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