Table 1.

Baseline characteristics of included studies based on geographical regions in China.

Region	Province	Author [reference]	Method	Publication year	Population	Number of IgG-positive sera	Prevalence (%)
Northwest	Shanxi	Ai et al. [16]	ELISA	2007	368	30	8.15
Northwest	Gansu	Wang et al. [17]	ELISA	1998	1480	150	10.14
Northwest	Xinjiang	Sun et al. [18]	IHA	1991	328	24	7.32
Southwest	Guizhou	Chen et al. [19]	ELISA	1999	500	32	6.40
Southwest	Guizhou	Hu et al. [20]	IHA	1991	200	1	0.50
Southwest	Sichuan	Wu et al. [21]	ELISA	1989	339	128	37.76
Southwest	Yunnan	Zhu et al. [22]	ELISA	2007	5068	1006	19.85
Southwest	Chongqing	Xu et al. [23]	ELISA	2017	1001	85	8.49
Northeast	Heilongjiang	Wang et al. [24]	ELISA	2002	264	56	21.21
North China	Hebei	Song et al. [25]	ELISA	2009	792	38	4.80
North China	Hebei	Song et al. [26]	ELISA	2012	1612	189	11.72
North China	Hebei	Wang et al. [27]	ELISA	2014	832	35	4.21
North China	Hebei	Yang et al. [28]	ELISA	2012	1056	51	4.83
North China	Hebei	Xin et al. [29]	ELISA	2013	864	44	5.09
North China	Hebei	Wu et al. [30]	ELISA	2017	1630	126	7.73
North China	Hebei	Shen et al. [31]	ELISA	2017	1165	83	7.12
Central China	Henan	Yang et al. [32]	IHA	1995	469	20	4.26
Central China	Henan	Luo et al. [33]	ELISA	2003	960	50	5.21
Central China	Henan	Sun et al. [34]	ELISA	2015	3200	98	3.06
Central China	Hubei	Gu et al. [35]	IHA	1989	2063	32	1.55
Central China	Hubei	Kuang et al. [36]	ELISA	2002	256	14	5.47
Central China	Hubei	Li et al. [37]	ELISA	2003	584	79	13.53
Central China	Hunan	Tong et al. [38]	ELISA	1994	1105	14	1.27
East China	Shandong	Feng et al. [39]	ELISA	1998	2025	259	12.79
East China	Jiangsu	Zhu et al. [40]	IHA	1987	300	17	5.67
East China	Jiangsu	Jiang et al. [41]	IHA	1991	212	12	5.66
East China	Jiangsu	Chen et al. [42]	IHA	1998	110	1	0.91
East China	Jiangsu	Wu et al. [43]	IHA	1994	1129	17	1.51
East China	Jiangsu	Zhu et al. [44]	IHA	1994	3542	156	4.40
East China	Jiangsu	Zhu et al. [45]	ELISA	1997	800	21	2.63
East China	Jiangsu	Yuan et al. [46]	ELISA	1998	723	15	2.07
East China	Jiangsu	Liu et al. [47]	ELISA	2001	2589	78	3.01
East China	Anhui	Wang et al. [48]	ELISA	1999	670	19	2.84
East China	Anhui	Shen et al. [49]	ELISA	2000	638	39	6.11
East China	Zhejiang	Meng et al. [50]	ELISA	1996	1197	215	17.96
East China	Zhejiang	Jiang et al. [51]	ELISA	2006	1023	58	5.67
South China	Guangdong	Zeng et al. [52]	ELISA	2005	680	49	7.21
South China	Guangdong	Zhong et al. [53]	ELISA	2010	1000	94	9.40
South China	Guangdong	Gu et al. [54]	ELISA	2010	4500	69	1.53
South China	Guangxi	Huang et al. [55]	ELISA	2013	2510	74	2.95