Table 1. AFP cases and surveillance sensitivity indicators in China, 1993–2022.

Year	No. of AFP cases	No. of WPV cases	<15 NPAFP	<15 NPAFP detection rate	No. of clinically compatible polio cases	No. of discarded polio cases	No. of VDPV cases
Note: “–” means not applicable. Abbreviation: AFP=acute flaccid paralysis; WPV=wild poliovirus; NPAFP=non-polio acute flaccid paralysis; VDPV=vaccine-derived poliovirus.
1993	1,879	63	1,226	0.37	653	–	–
1994	3,142	6	2,790	0.88	307	–	–
1995	4,801	1 (imported)	4,615	1.49	168	–	–
1996	4,372	3 (imported)	4,171	1.38	201	4,171	–
1997	4,730	0	4,730	1.59	42	4,688	–
1998	5,009	0	5,009	1.72	44	4,965	–
1999	5,079	1 (imported)	5,078	1.76	33	5,045	–
2000	5,332	0	5,332	1.85	17	5,315	–
2001	5,395	0	5,395	1.88	19	5,376	0
2002	5,415	0	5,415	1.89	20	5,395	1
2003	5,107	0	5,107	1.79	21	5,086	0
2004	5,285	0	5,285	1.86	19	5,266	2
2005	5,425	0	5,425	1.94	16	5,409	1
2006	5,635	0	5,635	2.02	10	5,625	1
2007	4,986	0	4,986	1.79	1	4,985	2
2008	5,154	0	5,154	1.91	3	5,151	0
2009	4,961	0	4,961	1.79	8	4,948	0
2010	5,285	0	5,285	1.91	3	5,282	1
2011	6,205	21	6,205	2.49	30	6,152	2
2012	6,172	0	6,172	2.76	2	6,168	2
2013	5,623	0	5,623	2.51	1	5,621	1
2014	5,758	0	5,758	2.56	0	5,756	2
2015	5,217	0	5,217	2.31	1	5,216	0
2016	5,691	0	5,691	2.52	0	5,690	1
2017	5,278	0	5,278	2.33	0	5,276	2
2018	5,292	0	5,292	2.31	0	5,292	1
2019	5,183	0	5,183	2.23	0	5,183	2
2020	4,369	0	4,369	1.85	0	4,369	2
2021	4,771	0	4,771	2.02	0	4,771	1
2022	4,228	0	4,228	1.79	0	4,228	0
Total	150,779	–	149,386	–	1619	140,429	24