Furthermore, our results showed that the CT scores in the progressive-stage group were significantly greater than those in the early-stage group. Further analysis showed that the CT scores were positively correlated with the maximum diameters of the lesions (r = 0.531), indicating that the range of lesions in the progressive stage was larger than and the degree of inflammation was more serious than that in the early stage. These results also showed that without any antiviral treatment, COVID-19 continued to progress 5–7 days after the onset of symptoms, without any improvement trend. Therefore, necessary clinical measures, including antiviral and supportive therapies, should be administered to prevent disease deterioration. Because of the lack of additional data, the correlation between the CT score and clinical classification and the prognosis of COVID-19 needs further study. Moreover, CT scores showed a significant positive correlation with ages in all 62 patients (r = 0.255). In a previous study on SARS, Grinblat et al considered that age was a risk factor for severe lung injury and poor prognosis of SARS [24]. Therefore, elderly patients need to be treated earlier and more actively than younger patients.