The incubation period of novel coronavirus pneumonia is relatively long, ranging from 2-3 days to 10-12 days, with the average being 7 days. Because it is relatively infectious, patients in the incubation period are equally infectious. During this period, if a nucleic acid test is performed, there are patients who can be identified as positive. When a highly suspicious patient undergoes nucleic acid testing, it can be done twice, at least 1 day between tests, and if one of them is positive, the patient is definitively diagnosed with novel coronavirus pneumonia. Patients in the incubation period are usually asymptomatic, have no abnormal blood work, and may have no pulmonary changes on chest radiographs. However, when nucleic acid testing is performed at this time, it is possible to detect the patient. During this time, due to continuous research and development by various research institutions, the timeliness of nucleic acid testing has improved significantly, enabling the patient to be diagnosed within a few hours, so that many suspected patients are clearly diagnosed. Content source: Dr. You Lai