CT images of a typical complete course of COVID-19 .(A)Imaging findings of COVID-19 on day 7 of onset,CT conducted on January 14th, (B) On day 8 of onset,the image classification showed progressive stage and bilateral lobe lesions, CT conducted on January 15th, (C)On day 10 of onset,fibrous exudation and gradual absorption,CT conducted on January 17th, (D)On day 13 of onset, improved fibrosis.CT conducted on January 20th, (E) On day 24 of onset, improved fibrosis.CT conducted on January 31st, (F) On day 26 of onset, before discharge.CT conducted on February 2nd. COVID-19: Coronavirus disease 2019; CT: Computed tomography.