Due to the long incubation period, infected people can be infectious even while not presenting symptoms or relatively asymptomatic. Bai, Yan, Lingsheng Yao, Ta

Due to the long incubation period, infected people can be infectious even while not presenting symptoms or relatively asymptomatic. Bai, Yan, Lingsheng Yao, Tao Wei, Fei Tian, Dong-Yan Jin, Lijuan Chen, and Meiyun Wang. “Presumed Asymptomatic Carrier Transmission of COVID-19.” JAMA, February 21, 2020. https://doi.org/10.1001/jama.2020.2565 https://doi.org/10.1001/jama.2020.2565. Guan, Wei-jie, Zheng-yi Ni, Yu Hu, Wen-hua Liang, Chun-quan Ou, Jian-xing He, Lei Liu, et al. “Clinical Characteristics of Coronavirus Disease 2019 in China.” New England Journal of Medicine 0, no. 0 (February 28, 2020): null. https://doi.org/10.1056/NEJMoa2002032 https://doi.org/10.1056/NEJMoa2002032. "Patients often presented without fever, and many did not have abnormal radiologic findings. ... Fever was present in 43.8% of the patients on admission but developed in 88.7% during hospitalization."