Fig. 3

Chest CT results: a Case B on the second day of admission, revealing no obvious abnormalities. b Case B on day 13 of admission, revealing the interstitial exudation in both lungs, with the most pronounced effect for the left lung. c Case B on day 20 of admission, revealing the infection of both lungs with bronchial traction, dilation of the left lung, and bilateral pleural thickening. d Case B on day 27 of admission, revealing interstitial pneumonia in both lungs, slightly larger exudative lesions than in the previous film, with no apparent change in lesion range and a limited amount of pleural effusion on the left side; 2. Signs of anemia