Assessment on the risk of schistosomiasis transmission and its control strategies in Hunan Province, 2022
XIA Meng, ZHOU Jie, CHENG Xianghui, CHENG Wei, LI Guangping, HU Benjiao, ZHENG Mao, FENG Jingtao, DENG Yi, TANG Ye, LUO Yangyang
Hunan Institute of Schistosomiasis Control; WHO Cooperation Center for Schistosomiasis Control and Prevention in Lake Region; Hunan Provincial Key Laboratory of Schistosomiasis Immunization and Transmission Control, Yueyang, Hunan 414000, China
Abstract：Objective To evaluate the risk of schistosomiasis transmission in Hunan Province in 2022, and to provide a basis for formulating the prevention and control strategies in the next stage. Methods According to the trend of epidemic situation of schistosomiasis and the social and environmental changing factors that might contribute to schistosomiasis epidemic in Hunan Province in recent three years, we selected one Class I monitored county and 10 Class II monitored counties (cities or districts) in surveillance sites of Hunan Province, and then 2-3 representative villages were selected from each county to serve as the surveyed villages. Data about the local epidemic and the status of implementing main prevention and control measures were collected, and risk factors for schistosomiasis transmission in each surveyed village were comprehensively analyzed combined with the status of field survey of Oncomelania hupensis snails, humans and livestock activities and field feces survey. The specific prevention and control strategies were formulated. Results No confirmed patients, schistosome-infected animals and schistosome-infected snails were found in all surveyed counties in recent three years. The results of on-site snail survey revealed that the snail habitats accounted for 74.19% (46/62) of the total habitats, and the average density of living snails was 0.19 snails/0.11㎡. Microscopy detection showed that noSchistosoma japonicum (S. japonicum) infections were identified in all the living snails collected. Among 342 mixed samples with nucleic acid testing based on loop-mediated isothermal amplification (LAMP) technique, 2 samples were positive. In the snail habitats, habitats with humans and livestock activities accounted for 22.58% (14/62) and 6.45% (4/62) respectively. A total of 160 field feces were collected, and no positives were found by means of egg hatching method after nylon mesh bag concentration. Risk factors like diffusion of Oncomelania snails, humans and livestock infections, livestock grazing in snail habitats and inadequate capacity building were prevalent in the surveyed sites. Conclusion At present, the risk of schistosomiasis transmission in Hunan Province is at a low level, but risk factors for transmission and spread and various difficulties still exist. It is necessary to consolidate the foundation, highlight the key points, and actively respond to the problems found in the risk assessment so as to steadily promote the process of schistosomiasis elimination in Hunan Province.
夏蒙, 周杰, 程湘晖, 成伟, 李广平, 胡本骄, 郑茂, 冯惊涛, 邓奕, 唐叶, 罗杨杨. 2022年湖南省血吸虫病传播风险评估分析与应对策略[J]. 实用预防医学, 2023, 30(12): 1445-1449.
XIA Meng, ZHOU Jie, CHENG Xianghui, CHENG Wei, LI Guangping, HU Benjiao, ZHENG Mao, FENG Jingtao, DENG Yi, TANG Ye, LUO Yangyang. Assessment on the risk of schistosomiasis transmission and its control strategies in Hunan Province, 2022. , 2023, 30(12): 1445-1449.
2023, Vol. 30 
