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目的：调查了解白沙县1987—1996年疟疾感染来源的变化情况，给防治工作提供科学依据。方法：由基层卫生机构的防保人员、乡村医生（卫生员）对“四热”病人血检阳性的5754例疟疾现症病人进行个案调查，以查明其感染来源。结果：村内感染从1987年的54．63％，下降至1996年的13．64％，呈显著下降（P＜0．01）；上山（村外）感染从1987年的43．92％，上升至1996年的84．09％，是显著上升（P＜0．01），上山感染与村内感染呈显著差异（P＜0．01）。结论：白沙县上山住宿的流动人群是疟疾感染的主要来源，说明加强上山住宿流动人群疟疾管理，是当今防治疟疾的重点。
Objective: To investigate and understand the source of malaria infection in Baisha County from 1987 to 1996, and provide a scientific basis for prevention and treatment. Methods: A total of 5754 cases of malaria cases with positive blood tests of “four hot” patients were investigated by grassroots health institutions and country doctors (health workers) to find out their sources of infection. Results: Infection in the village dropped from 54.63% in 1987 to 13.64% in 1996 (P <0.01), and the infection in the village (outside the village) increased from 43.92% in 1987 Up to 84.09% in 1996 (P <0.01). There was a significant difference between uphill infection and village infection (P <0.01). Conclusion: The floating population staying in Baisha County is the main source of malaria infection. It shows that strengthening malaria management in floating population in mountainous areas is the key point of malaria control.