大山区动物血吸虫病流行病学的调查研究

THE ROLE OF THE ANIMAL HOSTS IN THE EPIDEMIOLOGY OF SCHISTOSOMIASIS IN MOUNTAINOUS REGIONS

本文报道了在西南部大山区峡谷型血吸虫病流行区,传染源种类众多,家畜的EPD所占比率最大,约占总EPD的68.1％,动物宿主的重要性超过人宿主,认为在此类地区应重视和解决动物血吸虫病问题。

For studying the role of the animal hosts in the transmission of schistosomiasis in mountainous regions, 1548 domestic animals and 1263 habitants were investigated in Zhonghe Township, Weishan County, Yunnan Province in 1987. The results showed that 6 kinds of the domestic animals were natuially infected with Schislosoma japonicum by stool examination.The infection rates of cow, dog, pig, mule, donkey and horse were 16.5%, 9.6%, 9.3%, 3.5%, 1.8% and 1.4% respectively with the intensity of infection (EPG) of dog, cow, and pig, 12.8± 25.3, 2.2±3.3, 1.4±1.8 respectively. The stool positive rate of the habitants was 22.2% with EPG of 14.1 ± 42.2. The output of eggs per day of animal hosts were estimated to be 1,261,430 and of human hosts, 582,154. The densities of fresh-field-stools on the pasture and around the villages were 0.7 masses/l00m2. 99.1% of them was found from animal hosts and only 0.9% from human hosts. The positive late of field-fresh-stools was 6.5%. On account of the number of the hosts, output of eggs per day and the chance to contaminate, the role of anin al hosts in the transmission of schistosomiasis in these legions :s more important than human hosts. Therefore, the schistosomiasis control project should include the control of animal hosts,otherwise, it can hardly reach the object of control. WHO Collaborating Centre for Malaria, Schistosomiasis and Filariasis