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用流行病学方法观察垸内无螺而垸外有螺的一个湖洲垸型疫区,发现居民距大堤越远,接触疫水频度越小,疫情越轻,说明人群行为对血吸虫病的流行起重要作用。兴修水利时的泥土夹带是垸外钉螺扩散到垸内的一条重要途径。扩散到垸内的钉螺少数可存活30个月,此类疫区的传染源主要为外来的人、畜。
Epidemiological methods were used to observe the embankment non-spiraled embankment outside the snail embankment embankment-type embankment and found that residents farther from the levee, contact with the frequency of the smaller the epidemic, the lighter the epidemic, indicating that the behavior of the crowd of schistosomiasis Epidemic play an important role. When embarking on the construction of water conservancy, the entrainment of soil is an important way to diffuse into the embankment outside the embankment. A small number of snails spread to the embankment can survive for 30 months, the main source of infection in such endemic areas are outsiders and livestock.