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[How was endemic malaria eradicated?: community-based action in postwar Hikone].

Immediately after World War II, malaria became one of the major infectious disease threats in Japan. The prevalence of malaria was high in all regions in the summer of 1946. In most prefectures, the prevalence decreased with time thereafter and virtually no epidemics occurred after 1947. Shiga Prefecture, however, was an exception to this pattern. The epidemics in the prefecture occurred repeatedly until 1949, and the prevalence rapidly decreased in 1950. While the epidemics in most prefectures were caused by "imported malaria," those in Shiga Prefecture were caused by "indigenous malaria." This paper focuses on the eradication campaign of "endemic" malaria in Hikone City, Shiga prefecture after WWII. The city government began the campaign in April 1949. They established a malaria research institute for developing and implementing plans. The widespread spraying of insecticides such as DDT was implemented throughout the city and the moat around Hikone Castle was filled in, in order to reduce the mosquito population. Residents also cooperated extensively with programs for sanitation and health education. As a result of these efforts, malaria was completely eliminated in the city within six years. Malaria is still a life-threatening illness for many people in tropical areas of the world. Hikone's postwar experience could provide important lessons for malaria control programs in many places.