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为控制洲滩型地区血吸虫病流行,我们于1991—1993年在南京市栖霞区八卦洲乡、六合县玉带乡,采取重点滩块查灭螺和重点对象查治病的防治对策,以观察防治效果,现将结果报告如下.方法与结果1 钉螺分布调查1.l 钉螺分布以八卦江滩为调查点,每年4月份,以滩块为单位,采用框距10m×10m棋盘式系统抽样法查螺,结果大堤内圩区未发现活螺,大堤外30块芦草滩块块有螺.3年中有螺面积分别为319.3、368.8、379.5万m~2,有螺框出现率35.5%—61.5%,活螺密度(只/m~2)1.36—3.55.1.2 感染性钉螺分布以1992年查出的5块感染性钉螺洲滩统计,感染性钉螺服从负二项分布.30块滩中,28块发现感染性钉螺,3年中钉螺感染率分别为0.88%(249/28 408)、0.64%(293/45 810)和0.82%(99/12 028).1.3 钉螺感染率与野粪污染的关系 每年对试区的东江外滩进行野粪污染滩地和钉螺感染率调查,前者依次为0.445、0.858、0.207份/万m~2,后者依次为0.065%、1.390%、0.211%,两者等级相关显著(r_s=0.943,P<0.01).2 重点滩块和重点对象防治措施2.1 重点滩块灭螺 凡查到有感染螺的滩块,实施高水量五氯酚钠喷洒灭螺.结果,在八卦洲试区内,1991—1993年阳性螺面积分别为166 083、167 477、145 406m~2,阳性螺密度(只/m~2)分别为0.024、0.026、0.012,钉螺感染率
In order to control the schistosomiasis epidemic in the area of beachland type, we took measures to prevent and cure schistosomiasis in key beaches in Baguzhou Township and Yuhe Township of Liuhe County from 1991 to 1993 in order to observe prevention and treatment The results are reported as follows.Methods and Results 1 snail distribution survey 1.l Snail distribution to gossamer beach as a survey point, in April each year to the beach block as a unit, using the frame distance 10m × 10m Checkerboard sampling method As a result, no live snail was found in the dike in the embankment, and 30 Lucaotan blocks outside the embankment had snails. The area of snails in 3 years was 319.3, 368.8, 3795000m2 respectively, and the occurrence rate of screw frame was 35.5% -61.5 %, Live spiral density (only / m ~ 2) 1.36-3.55.1.2 Infectious snail distribution In 1992 found five infectious snail beach statistics, infective snail distribution from the negative binomial distribution .30 block beach, Infectious snails were found in 28 cases, and the infection rates of snails in three years were 0.88% (249/28), 0.64% (293/45 810) and 0.82% (99/12 028), respectively.1.3 The infection rates of snails and wild feces Relationship Each year on the Dongjiang Bund test area contaminated beaches and snails infection rate survey, the former were 0.445,0.858,0.207 copies / million m ~ 2, the latter followed by 0.065%, 1.390%, 0.211%, the two rank correlation was significant (r_s = 0.943, P <0.01) .2 key beach block and the focus of prevention and treatment measures 2.1 key beach block snail found any infection Spirale block, the implementation of high-level sodium pentachlorophenol spray molluscum.Results in the test area of Baguazhang, 1991-1993, the positive spiral area were 166 083,167 477,145 406m 2, the positive spiral density (only / m ~ 2) were 0.024,0.026,0.012, snail infection rate