Objective: To evaluate the potential risk of schistosomiasis transmission so as to provide the evidence for formulating the control strategy.
Methods: Two villages were selected as the investigated sites in Chuxiong City and the risk of schistosomiasis transmission was evaluated by reviewing the data of schistosomiasis epidemic situation and prevention and control work, and carrying out the field survey for Oncomelania hupensis snail status, wild faeces, and schistosome infection of the population from 2015 to 2017.
Results: There was 1.49 hm2 area of snail habitats, with an average density of 0.54 snails/0.1 m2. The occurrence rate of frames with snails was 5.41%. No schistosome-infected snails were found. The positive rate of schistosomiasis serological tests of the residents was 3.36%, but the stool examination positive cases were not found. A total of 58 wild faeces samples were collected but no schistosome infested cases were found. The risk levels of schistosomiasis transmission in both villages were Grade III.
Conclusions: Although Chuxiong City has been in a low risk state of schistosomiasis transmission, the density of snails is still high, and there is a risk of infection source importation. In the future, the infection source control and snail control should be strengthened.
[摘要] 目的 评估楚雄市血吸虫病潜在传播风险, 为制订防治策略提供依据。方法 选择楚雄市军屯村者纳屯和李 家村腰站 2 个自然村作为风险评估村, 通过查阅、审核和收集 2015–2017 年 2 个村血吸虫病疫情和防治资料, 结合钉螺、野粪与人群病情等现场调查结果, 分析楚雄市血吸虫病传播风险。结果 楚雄市者纳屯和腰站 2 个村共有钉螺分布面积 1.49 hm2, 钉螺平均密度 0.54 只/0.1 m2, 有螺框出现率为 5.41%, 未发现血吸虫感染性钉螺; 居民血清学阳性率为 3.36%, 未发现粪检阳性血吸虫感染者。共捡获并检测各类野粪 58 份, 未查到血吸虫感染阳性野粪。2 个村血吸虫病传播风险评级均为III级。结论 虽然楚雄市已处于血吸虫病低传播风险状态, 但钉螺分布密度仍较高, 且存在传染源输入等风险。今后仍应加强传染源控制, 加大灭螺工作力度, 巩固血吸虫病防治成果。.
Keywords: Chuxiong City; Oncomelania snail; Schistosomiasis; Transmission risk.