论文部分内容阅读
目的调查山丘型、水网型和湖沼型血吸虫病流行区不同密度的钉螺在水网型流行区的生长繁殖情况,分析其他流行区钉螺输入水网型流行区的可能性,为防止钉螺输入和实施防控措施提供科学依据。方法 2014年4月选择水网型血吸虫病流行区浙江省嘉兴市秀洲区,设立钉螺繁殖现场试验地点,将山丘型流行区(浙江省金华市)、水网型流行区(浙江省秀洲区)和湖沼型流行区(安徽省贵池区)钉螺分3个实验组,每组按每框(0.1 m~2)2、4、6、8、10、20、40、80、100、150、200、400、800只的钉螺密度进行投放,其中低密度(≤40只/框)各组雌雄配对,高密度(>40只/框)各组随机组合,养殖1年后观察各组钉螺生存繁殖情况。结果山丘型、水网型和湖沼型钉螺存活率分别为17.45%、4.95%和7.47%,低密度组存活率分别为48.33%、35.56%和34.44%,高密度组存活率分别为15.84%、3.35%和6.07%。3种不同流行区钉螺繁殖倍数分别为1.99、3.10和1.95,低密度组繁殖倍数分别为14.48、24.81和11.42,高密度组繁殖倍数分别为1.34、1.97和1.46。不同流行区钉螺低密度及高密度组间的存活率和繁殖倍数差异均有统计学意义(P<0.05)。结论不同流行区钉螺均可在水网型流行区生长繁殖,钉螺存活率和繁殖倍数均与其密度呈负相关。
Objective To investigate the growth and reproduction of snails of different densities in hill-type, water-net-type and lacustrine-type schistosomiasis endemic areas and to analyze the possibility of entering snail-type endemic areas in other endemic areas, And provide a scientific basis for the implementation of prevention and control measures. Methods In April 2014, Xiuzhou District, Jiaxing City, Zhejiang Province, was selected as the endemic area of water-borne schistosomiasis. Site of oncomelania testis was established. The hill endemic area (Jinhua City, Zhejiang Province), water network endemic area (Zizhou area) and snail swamp endemic area (Guichi District, Anhui Province) were divided into 3 experimental groups. Each group was divided into two groups (0.1 m ~ 2, 2,4,6,8,10,20, 40,80 and 100 , 150,200,400,800 snails. The low-density (≤40 / box) males and females were paired, and the high-density (> 40 / box) Group Snail survival and reproduction. Results The survival rates of hill snails, water net and lagoon snails were 17.45%, 4.95% and 7.47%, respectively. The survival rates of low-density group were 48.33%, 35.56% and 34.44%, respectively. The survival rates of high-density group were 15.84% , 3.35% and 6.07% respectively. The reproductive multiples of Oncomelania snails in three different endemic areas were 1.99, 3.10 and 1.95, respectively. The multiplication rates of low density group were 14.48, 24.81 and 11.42, respectively. The multiplication multiples of high density group were 1.34, 1.97 and 1.46 respectively. The survival rates and multiplication multiples of snail low-density and high-density groups in different endemic areas were significantly different (P <0.05). Conclusion Snails in different endemic areas can all grow and multiply in the water net type endemic area, and the survival rate and reproduction multiples of snails are negatively correlated with their density.