Abstract:

Objective To investigate the epidemic status of schistosomiasis in Zhejiang province, so as to provide scientific data for the strategies for schistosomiasis control. Methods The snail survey was conducted by the method of five meter synchronously systematic samplings combined with the environmental samplings. The snails were dissected to determine the infection status and were controlled by molluscacide combined with environmental modification. Both residents, migrating population and domestic animals were screened by serological methods, and the positive cases were confirmed by miracidium hatching method. Results The snail-infestation area was 657 200 m² in 328 villages of 94 towns in Zhejiang province in 2015. Among them, the area of 8 600 m² was newly detected. No infection was found among 78 428 snails dissected. In total 112 800 individuals were examined by serological methods, and 679 persons were positive and the positive rate is 0.60%. No native cases or livestock were found except 8 imported cases. 1 119 advanced patients were treated and medical care provided. Conclusion The results of surveillance showed the current stable schistosomiasis endemics in Zhejiang province. However, a risk factor for re-emergence of schistosomiasis still exists. Comprehensive strategy including emphasizing on prevention and control of residual snail and import cases should be stressed in the future.

Key words: Schistosomiasis, Surveillance, Snail, Import case

摘要：

目的 掌握浙江省血吸虫病疫情变化趋势，为制定防治策略提供科学依据。方法 采用5 m系统抽样结合环境抽查方法进行查螺，利用压碎法检查钉螺感染情况，药物结合土埋方法进行灭螺；通过血清学方法过筛再用尼龙绢袋集卵孵化法对居民、流动人群及家畜进行血吸虫病检测。结果 2015年浙江省有螺乡（镇）94个，村328个，实有钉螺面积65.72 hm²，新查出有螺面积0.86 hm²；解剖钉螺78 428只，未发现感染性钉螺。血清学调查阳性率为0.60%（679/112 800）；输入性血吸虫病患者8例；未发现本地粪检阳性病例（或病畜）。共救治晚期血吸虫病患者1 119例。结论 浙江省血吸虫病疫情稳定，但重新传播的流行因素仍然存在，应坚持以查灭钉螺和防控输入性传染源为主的综合巩固策略。

关键词: 血吸虫病, 监测, 钉螺, 输入性病例