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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 |
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