Table 2. Probabilities (%) of the 20 major airports reporting positive wastewater samples from Wuhan by different time points—30 December 2019, 7 January 2020, 13 January 2020, and 22 January 2020, assuming wastewater was tested from 100%, 50%, 20%, or 10% of inbound flights.

P{Sampled} (%)	30 Dec 2019	7 Jan 2020	13 Jan 2020	22 Jan 2020
100	0.92	6.37	25.5	93.0
50	0.46	3.24	13.7	73.4
20	0.18	1.31	5.7	41.0
10	0.09	0.66	2.9	23.2