Fig. 1.

A 62-year-old man with a history of exposure, presenting with fever, cough, expectorating white phlegm, nausea, and vomiting. a–c Axial unenhanced chest CT revealed multiple confluent and patchy ground-glass and consolidative pulmonary opacities in the subpleural area bilaterally upon hospital admission on January 29, 2020. The patient underwent a swab test, which was negative for COVID-19 according to a real-time reverse transcription–polymerase chain reaction (RT-PCR) assay on January 30, 2020. The patient underwent a second swab RT-PCR test on January 31, 2020, and the COVID-19 infection was finally confirmed