2018年安徽省石台县野鼠血吸虫感染调查

Investigation on prevalence of Schistosoma japonicum infections in wild mice in Shitai County,Anhui Province,2018

目的了解安徽省石台县野鼠血吸虫感染情况,为实施精准传染源防控策略提供依据。方法选择石台县3个不同血吸虫病流行程度的自然村(矶滩乡矶滩村、丁香镇石泉村和丁香镇西柏村),于2018年6月和10月分别采取“夹夜法”连续3晚在有螺环境捕捉野鼠,对捕获野鼠采取肝结节压片镜检、肠系膜静脉压片镜检和Kato-Katz法等3种方法平行检查,统计捕获的野鼠密度和血吸虫感染率。结果石台县3个调查村共捕获野鼠376只,平均野鼠密度为9.1%(376/4124),平均血吸虫感染率为24.2%(91/376)。其中丁香镇石泉村野鼠血吸虫感染率最高,为30.1%;丁香镇西柏村野鼠血吸虫感染率最低,为17.4%;各村野鼠血吸虫感染率差异无统计学意义(χ^(2)=4.111,P>0.05)。6月和10月野鼠血吸虫感染率分别为26.8%(34/127)和22.9%(57/249),差异无统计学意义(χ^(2)=0.690,P=0.406)。捕获的野鼠包括褐家鼠、社鼠、黄毛鼠、黑线姬鼠、小家鼠和白腹巨鼠等6种,其中黄毛鼠和褐家鼠血吸虫感染率较高,分别为34.9%(22/63)和31.2%(44/141)。结论2018年石台县野鼠血吸虫感染率较高,当地血吸虫病传播存在自然疫源性。

Objective To investigate the prevalence of Schistosoma japonicum infection in wild mice in Shitai County,Anhui Province,so as to provide insights into precise control of the source of S.japonicum infections.Methods Wild mice were captured using the trapping method for three successive nights at snail-infested settings from Jitan Village of Jitan Township,and Shiquan Village and Xibai Village of Dingxiang Township,Shitai County,Anhui Province in June and October,2018.All trapped wild mice were sacrificed and liver and mesenteric vein specimens were collected for detection of S.japonicum eggs using microscopy,while the fecal samples in mouse intestines were collected for identification of S.japonicum infections using Kato-Katz technique.In addition,the population density of trapped wild mice was estimated and the prevalence of S.japonicum infection was calculated in trapped wild mice.Results A total of 376 wild mice were trapped from three villages in Shitai County.The population density of trapped wild mice was 9.1%(376/4124),and the prevalence of S.japonicum infection was 24.2%(91/376)in trapped wild mice.The highest prevalence of S.japonicum infection was detected in Shiquan Village of Dingxiang Township(30.1%),and the lowest prevalence was seen in Xibai Village of Dingxiang Township;however,there was no significant difference in the prevalence of S.japonicum infection in trapped wild mice among three villages(χ^(2)=4.111,P>0.05).In addition,there was no significant difference in the prevalence of S.japonicum infection in wild mice captured between on June(26.8%,34/127)and October(22.9%,57/249)(χ^(2)=0.690,P=0.406).The trapped wild mice included 6 species,including Rattus norvegicus,Niviventer niviventer,R.losea,Apodemus agrarius,Mus musculus and N.coning,and the two highest prevalence of S.japonicum infection was detected in R.losea(34.9%,22/63)and R.norvegicus(31.2%,44/141).Conclusions The prevalence of S.japonicum infections is high in wild mice in Shitai County,and there is a natural focus of schistosomiasis transmission in Shitai County.