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１９９６～１９９７年，豫南桐柏山区发生了间日疟暴发流行，经过三年防治，于１９９９年１１月上旬共同组织力量，采取了回顾性流行病学调查方法，以桐柏县为重点对其流行成因，抗疟措施取得的防治效果进行了现场流行病学调查，以便今后为同类型疟区开展防治工作提供科学依
From 1996 to 1997, an outbreak of Plasmodium falciparum malaria occurred in the Tongbai Mountainous area of southern Henan. After three years of prevention and control, the two groups jointly organized their forces in early November 1999 and adopted a retrospective epidemiological investigation method focusing on Tongbai County Its epidemic causes, prevention and control of malaria measures conducted on-site epidemiological investigation in order to provide scientific basis for the prevention and treatment of malaria-endemic areas in the future