EFFECTS OF WATER VELOCITIES ON WORM BURDENS OFANIMALS EXPOSED TO SCHISTOSOMA MANSONI CERCARIIAE RELEASED UNDER LABORATORY AND FIELD CONDITIONS
EFFECTS OF WATER VELOCITIES ON WORM BURDENS OFANIMALS EXPOSED TO SCHISTOSOMA MANSONI CERCARIIAE RELEASED UNDER LABORATORY AND FIELD CONDITIONS
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DOI：
10.1016/0014-4894(61)90039-x
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发表时间：
1961-01-01
影响因子：
2.1
通讯作者：
ROWAN, WB
中科院分区：
文献类型：
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作者：
RADKE, MG;RITCHIE, LS;ROWAN, WB
1.当水的流速达到每小时2.7英里时，尾蚴的感染性在暴露的小鼠中降低。2.动物暴露于寄生尾蚴之间的间歇干燥间隔未显示动物蠕虫负荷的可检测差异。3.无尾蚴的流动沃茨动物接触到尾蚴并没有减少蠕虫的负担。4.从尾蚴感染的沃茨获得的动物蠕虫负担与尾蚴被带到下游的距离成反比。5.通过Rowan的尾蚴计数器检测到，释放的尾蚴携带到下游2000英尺处的数量没有损失;因此，表明尾蚴在形态完整性丧失之前就丧失了感染性。6.一些尾蚴被带到下游5000英尺的地方，能够在脊椎动物宿主中完成它们的生命周期。7.在一个仔细控制的实验中，暴露在1到120分钟之间，暴露30分钟或更长时间的小鼠不仅每只小鼠获得更多的蠕虫，而且比暴露15分钟或更短的小鼠具有更高的感染率。限制血吸虫病感染的两个重要因素是（1）水流速度和（2）尾蚴携带到下游的距离。
1. The infectivity of cercariae was reduced in exposed mice when water velocities attained 2.7 miles per hour. 2. Intermittent drying intervals between animal exposures to schistosome cercariae showed no detectable difference in animal worm burdens. 3. Cercariae-free flowing waters following animal exposure to cercariae did not reduce the worm burden. 4. The animal worm burden acquired from cercariae-infested waters was inversely proportional to the distance cercariae were carried downstream. 5. No loss in the number of released cercariae carried as far as 2000 feet downstream was detected by Rowan''s cercariometer apparatus; thus, suggesting that cercariae lose their infectivity prior to loss of morphological integrity. 6. Some cercariae carried up to 5000 feet downstream were capable of completing their life cycle in the vertebrate host. 7. In a carefully controlled experiment with exposures between one to 120 minutes, mice exposed 30 minutes or longer not only acquired more worms per mouse but had a higher infection rate than mice exposed 15 minutes or less. 8. Two important factors in limiting infections of schistosomiasis are (1) velocity of water and (2) distance cercariae are carried downstream.