论文部分内容阅读
目的调查斯氏并殖吸虫第二中间宿主孳生环境及自然感染情况的变化并对其影响因素进行分析。方法调查收集部分县(市)斯氏并殖吸虫自然疫源地中间宿主溪蟹及动物宿主自然感染情况,观察和分析人类行为、局部环境的改变对中间宿主孳生、感染的影响。结果调查显示环境因素、人类行为对斯氏并殖吸虫疫源地、第二中间宿主溪蟹孳生和囊蚴自然感染有明显的影响,平均感染率由1985～1995年的17.08%降为1996～2007年的5.96%。结论生态环境改变和人类的行为直接影响了野生动物的活动范围及中间宿主的孳生,导致中间宿主囊蚴的感染率逐渐降低。但随着退耕还林实施,生态环境的改善,有利于中间宿主螺和溪蟹的孳生和繁殖,可能形成新的疫源地。溪流中蟹类肺吸虫囊蚴感染可能随之加重,人群感染肺吸虫的机会也可能随之增加。
Objective To investigate the changes of the environment and natural infection of the second intermediate host of Paragonimus schistosomiasis and to analyze its influential factors. Methods The natural infection of crabs and animal hosts in central hosts of Paragonimus schistosomiasis in counties (cities) were investigated. The effects of human behavior and local environmental changes on the breeding and infection of intermediate hosts were observed and analyzed. Results The survey showed that environmental factors and human behavior had significant effects on the breeding of Syphilis and Syphilis, the second intermediate host, and natural infection of metacercaria. The average infection rate was reduced from 17.08% in 1985 ~ 1995 to 1996 ~ 5.96% in 2007. Conclusion The change of ecological environment and the behavior of human beings directly affect the range of activities of wild animals and the breeding of intermediate hosts, leading to the decreasing infection rate of intermediate host metacercariae. However, with the implementation of the project of converting the grain plots to forestry and the improvement of the ecological environment, it is favorable to breeding and breeding of the intermediate host snails and crabs, which may form a new source of foci. Crabs may become infected with metacercariae of crabs in streams, and the chances of people infected with paragonimiasis may also increase.