The COVID-19 epidemic is still ongoing at the time of writing, and the estimates are revised from time to time in the literature as new data become available. The current estimates include the following. The incubation period is estimated to be between 2 and 10 days (World Health Organization 2020a), 5.2 days (Li et al. 2020), or 3 days (median, Guan et al. (2020)). The average infectious period is estimated to be 1.4 days (Wu et al. 2020a).