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目的 了解元江流域不同海拔高度 ,不同人群中的疟疾流行程度和感染疟疾的相对危险度。 方法 采用寄生虫学和血清学相结合的方法开展横断面调查 ,对资料进行层分析。 结果 间接荧光抗体实验 (IFAT)结果显示 ,1)以低海拔地区的本地居民为对照 ,来自区外的流动人口 ,来自中海拔和高海拔地区的下坝生产人员感染疟疾的相对危险度 (RR)分别是 4.46( 95 %CI :3.44～ 5 .78) ,8.38( 95 %CI :6.41～ 10 .92 )和 6.31( 95 %CI:4.92～ 8.90 ) ;2 )以年龄<15岁为对照 ,中高海拔地区 ,≥ 15岁劳动力年龄组的RR是 2 .76( 95 %CI :2 .40～ 3.81) ;3)带虫率分析显示 ,与当地居民相比 ,低海拔地区打临工者的RR是 2 0 .64( 95 %CI :4.76～ 89.5 9)。 结论 在该地区 ,疟疾的传播依然严重 ,并主要发生在低海拔地区 ;在野外过夜和缺乏个人防护措施是感染疟疾的危险因素
Objective To understand the prevalence of malaria and the relative risk of malaria infection in different populations at different altitudes in the Yuanjiang River Basin. Methods A cross-sectional survey was conducted using a combination of parasitology and serology to analyze the data. Results The results of indirect fluorescent antibody test (IFAT) showed that 1) the relative risk of malaria infection among downstream migrants from mid-altitude and high-altitude areas was significantly lower than that of migrants from low-altitude areas ) Were 4.46 (95% CI: 3.44-5.78), 8.38 (95% CI: 6.41-10.92) and 6.31 (95% CI: 4.92-9.90), respectively; 2) In middle and high altitude areas, the RR of the labor force of ≥15 years old was 2.76 (95% CI: 2.40 ~ 3.81). 3) The incidence of parasitosis showed that compared with the local residents, RR was 20.64 (95% CI: 4.76-89.5 9). Conclusions In the region, the spread of malaria is still severe and mainly occurs at low elevations; overnight stays in the field and the lack of personal protection are risk factors for malaria