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贵州省铜仁地区1990年实现全区十县(市、特区)基本消灭疟疾后,输入性病例占疟疾疫情的82.93％,其中外出广东回归的劳务人员发病的病例数占40.94％。1991年1～7月各县监测报告的广东回归病例占外源性病例的92.49％,广东省江门市、中山市防疫站亦寄来我区劳务人员在该站门诊诊断疟疾和原虫阳性名单141例。为了摸清当地居民外出从事劳务的人口流动强度和疟疾的发病情况,1991年7～9月在五县39个乡的26万人群中进行了人群流向和疟区流动人口的疟疾调查。
In Tongren Prefecture, Guizhou Province, 90% of imported malaria cases were accounted for 82.93% of the total malaria cases in 10 counties (cities and special areas) in the whole region in 1990, of which 40.94% of them were laborers returning from Guangdong. From January to July 1991, the counties in Guangdong reported 92.49% of the cases of exogenous surveillance. The epidemic prevention stations in Jiangmen City and Zhongshan City of Guangdong Province were also sent to the list of positive cases of malaria and protozoan diagnosed by labors in our station example. In order to find out the intensity of population movements and the incidence of malaria in the labor service of local residents, a malaria investigation was conducted among the population of 260,000 people in 39 townships of five counties in July-September 1991 and the migratory population in malaria-endemic areas.