Table 1.

New SARS-CoV-2 infections reported in China from 31 March 2020 to 8 August 2021 divided by time alpha and delta variants were first identified (14 December 2020 and 22 April 2021, respectively)

Time	Total No of new infections	No of symptomatic infections	No (%) of asymptomatic and pre-symptomatic infections	No of pre-symptomatic infections (% of pre-symptomatic plus asymptomatic)
31 Mar 2020-13 Dec 2020	10 655	4 900	5 755 (54)	815 (14)
14 Dec 2020–21 Apr 2021	7004	3 806	3 198 (46)	934 (29)
22 Apr 2021–8 Aug 2021	5618	3 279	2 339 (42)	466 (20)