Chin J Schisto Control ›› 2018, Vol. 30 ›› Issue (4): 410-414.

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Assessment of schistosomiasis transmission risk after flood damage in Wuhan City

WANG Hao*| XIONG Yue-ling| ZHANG Jia-jing| LI Yang| ZUO Yu-ting| XU Ming-xing   

  1. Wuhan Center for Disease Control and Prevention| Hubei Province| Wuhan 430015| China
  • Online:2018-10-08 Published:2018-10-09



  1. 湖北省武汉市疾病预防控制中心(武汉 430015)
  • 作者简介:王浩|男|硕士|副主任医师。研究方向:血吸虫病防治
  • 基金资助:

Abstract: Objective To assess the schistosomiasis transmission risk after flood damage in Wuhan City. Methods Schistosomiasis epidemic villages in Wuhan City were selected by using probability proportional to size sampling (PPS). The field investigations of Oncomelania hupensis snails, the activity of people and cattle on marshland, water infectivity of schistosome, reservoir host infection and wild feces contamination were conducted. I-III levels of risk environments were assessed and treated with appropriate measures. Results A total of 90 schistosomiasis epidemic villages and 170 environments were monitored. Totally 9 811 snails were dissected but no Schistosoma japonicum infected snails were found. There were significant decreases in the density of snails and the survival rate of living snails after the flood ([χ2] = 102.517, t = 4.724, both P < 0.01). Totally 289 pieces of wild feces were captured, and no eggs of S. japonicum were detected. A total of 11 surveillance and forecast sites were detected on water systems, and 221 sentinel mice were placed. After breeding, 219 sentinel mice survived (99.10%), and no schistosome infection was detected. In addition, 1 720 mouse traps were placed in 3 survey sites, and 66 Apodemus agrarius were captured, and no schistosome?infected ones were found. All of the environments were assessed as Grade III. Meanwhile, 5 key schistosomiasis control areas were determined, and no emergency happened after the implementation of comprehensive control interventions. Conclusion The risk of schistosomiasis transmission remains low in Wuhan City after the flood, but the potential epidemic risk cannot be ignored.

Key words: Schistosomiasis; Flood damage; Transmission risk; Wuhan City

摘要: 目的 评估武汉市洪涝灾害后血吸虫病传播的潜在风险。方法 2017年4-10月在武汉市采用容量比例概率法(PPS法)选择抽样村,现场进行螺情、人畜活动情况、水体血吸虫感染性、江滩保虫宿主和野粪污染情况调查,评定I~III级风险村。划分血吸虫病防治重点区域,采取相应措施进行处理。结果 武汉市90个抽样村共调查170个螺点,捕获钉螺9 811只,解剖后未发现血吸虫感染阳性钉螺;洪涝灾害后钉螺存活率([χ2] = 102.517,P < 0.01)和活螺密度(t = 4.724,P < 0.01)均下降;共收集野粪289份,检测后未查出血吸虫卵;11个哨鼠监测点共投放哨鼠221只,饲养后存活219只,存活率99.10%,解剖后未发现血吸虫感染阳性;3个野鼠捕获点共投放捕鼠夹1 720只,共捕获黑线姬鼠66只,解剖后未发现血吸虫感染阳性。根据风险评估标准各抽样村均属于Ⅲ级风险。共划分5块血吸虫病防治重点区域,采取综合措施干预后,未发生血吸虫病突发疫情。结论 洪涝灾害后武汉市血吸虫病传播风险水平较低,但潜在传播风险不容忽视。

关键词: 血吸虫病;洪涝灾害;传播风险;武汉市

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