In the early stages of the disease, a person can have the virus and show a normal CT scan. In fact, a carrier can be asymptomatic. That makes it extremely difficult to know whether any individual at a given point in time has the virus. It invalidates the current border screening that the US is using.
- Michael Chung, Adam Bernheim, Xueyan Mei, Ning Zhang, Mingqian Huang, Xianjian Zeng, Jiufa Cui, Wenjian Xu, Yang Yang, Zahi Fayad, Adam Jacobi, Kunwei Li, Shaolin Li, Hong Shan. CT Imaging Features of 2019 Novel Coronavirus (2019-nCoV). Radiology, 2020; 200230 DOI: 10.1148/radiol.2020200230
- Jeffrey P. Kanne. Chest CT Findings in 2019 Novel Coronavirus (2019-nCoV) Infections from Wuhan, China: Key Points for the Radiologist. Radiology, 2020; 200241 DOI: 10.1148/radiol.2020200241
- Radiological Society of North America. “Radiologists describe coronavirus imaging features.” ScienceDaily. ScienceDaily, 5 February 2020. www.sciencedaily.com/releases/2020/02/200205084211.htm