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  • Title: [Spatio-temporal distribution characteristics of soil-transmitted nematodiasis in Sichuan Province from 2016 to 2021].
    Author: Wu XH, Tian HC, Luo JW, Tie L, Zhang LP, Deng X, Liu Y.
    Journal: Zhongguo Xue Xi Chong Bing Fang Zhi Za Zhi; 2022 Nov 14; 34(5):484-492. PubMed ID: 36464262.
    Abstract:
    OBJECTIVE: To investigate the trends in the prevalence of soil-transmitted nematode infections and the spatio-temporal distribution characteristics of soil-transmitted nematodiasis in Sichuan Province from 2016 to 2021, so as to provide the evidence for formulating the soil-transmitted nematodiasis elimination strategy in Sichuan Province. METHODS: The soil-transmitted nematodiasis surveillance data in Sichuan Province from 2016 to 2021 were collected, and the epidemic trend of soil-transmitted nematode infections was identified. The distribution maps of soil-transmitted nematode infections in Sichuan Province were plotted to identify their spatial distribution characteristics. In addition, the spatial clusters of soil-transmitted nematode infections were detected using globa and local spatial autocorrelation analyses. RESULTS: The prevalence of soil-transmitted nematode infections appeared a decline with time in Sichuan Province from 2016 to 2021 (χ2= 400.24, P < 0.01). Global spatial autocorrelation analysis identified positive spatial autocorrelations in the prevalence of soil-transmitted nematode infections (Moran's I = 0.322, Z = 16.293, P < 0.01), hookworm infections (Moran's I = 0.425, Z = 21.290, P < 0.01), Ascaris lumbricoides infections (Moran's I = 0.102, Z = 5.782, P < 0.01) and Trichuris trichiura infections (Moran's I = 0.084, Z = 6.873, P < 0.01). Local spatial autocorrelation analysis showed that the high-high clusters of soil-transmitted nematode infections were mainly located in 37 counties (cities, districts) of Sichuan Province, and the high-high clusters of hookworm, A. lumbricoides and T. trichiura infections were mainly identified in 39 counties (cities, districts) in mountainous areas around Sichuan Basin and hilly areas, 9 counties (cities, districts) in mountainous areas in southwestern Sichuan Province, and 8 counties (cities, districts) in mountainous areas in southwestern Sichuan Province, respectively. CONCLUSIONS: The prevalence of soil-transmitted nematode infections appeared a tendency towards a decline in Sichuan Province from 2016 to 2021, which showed spatial clusters. The management of soil-transmitted nematodiasis requires to be reinforced in high-risk areas of Sichuan Province with adaptations to local epidemiological features. ［摘要］ 目的分析2016—2021年四川省土源性线虫病流行趋势和时空分布特征, 为制定四川省土源性线虫病消除策 略提供参考依据。方法 收集2016—2021年四川省土源性线虫病监测资料, 分析其流行趋势;绘制土源性线虫感染率 分布特征图并分析其空间分布特征, 采用全局和局部空间自相关分析探索土源性线虫感染率空间聚集性。结果 2016—2021年四川省土源性线虫感染率随时间推移逐渐下降(χ2 = 400.24, P < 0.01)。全局空间自相关分析发现, 四川省土源 性线虫(Moran’s I = 0.322, Z = 16.293, P< 0.01)、钩虫（Moran’s I = 0.425, Z = 21.290, P < 0.01)、蛔虫（Moran’s I =0.102, Z = 5.782, P < 0.01)、鞭虫（Moran’s I = 0.084, Z = 6.873, P < 0.01)感染率均存在正向空间自相关。局部空间自相关分析 发现, 四川省土源性线虫感染率“高-高”聚集区域主要分布于37个县(市、区), 其中钩虫、蛔虫、鞭虫感染率“高-高”聚集 区域分别主要分布在盆周山地区和丘陵地区的39个县（市、区)、川西南山地区的9个县（市、区)和川西南山地区的8个 县(市、区)。结论 2016—2021年四川省土源性线虫感染率随时间推移逐渐下降, 呈空间聚集性, 应根据土源性线虫病 流行特征加强重点地区防控工作。.
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