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在云南元江流域,通过5年的面上监测和1年的设点研究,发现杀虫剂使用后40多年,微小按蚊的活动从室内转到室外,从村子内转到野外,人类和微小按蚊间的疟原虫传递多发生在室外;影响河谷区微小按蚊种群数量的关键生态学因子是降水;温度是影响其寿命的首要因子,其次是相对湿度。上述因素影响微小按蚊密度和叮人率;7—8月份种群数量不大,但病例却较多。结果揭示使用了40多年的DDT室内滞留喷洒为主的疟疾媒介控制措施不能完全有效地阻断疟疾传播。
In the Yuanjiang River valley in Yunnan Province, after five years of monitoring on the surface and a one-year set-point study, it was found that after an insecticide was used for more than 40 years, the activity of Anopheles minimus moved from the interior to the outdoors, Anopheline mosquito transmission occurs in the outdoor and more; the impact of valley population Antimycobacterium mosquito population is the key ecological factor precipitation; temperature is the primary factor affecting its longevity, followed by relative humidity. The above factors affect the density and bite rate of Anopheles minimus; the population in July-August is small, but there are more cases. The results revealed that malaria vector control, using more than 40 years of DDT indoor retention spraying, did not completely block the spread of malaria.