Fig. 1

A older female patient with a long residence history in an epidemic area experienced fever(38.5 °C) and sore muscle for 1 day. a Feather hand painting. b Baseline chest CT image demonstrated GGO in the right middle lobe, showing a “feathery sign” (red arrow). The nucleic acid test was negative for the first time. c Follow-up CT scan after 6 days showed that the lesions were significantly enlarged. GGO in the lungs was multiple (white arrow). The second test was positive for nucleic acid