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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. 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. "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." |