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淄博市布氏菌病（简称布病）最早发现于１９５４年，且为山东省建国后首例，后经积极防治，人间自１９７６年、畜间自１９８５年未有疫情及病畜出现。但自１９８９年发现２例病人后，布病疫情在淄博市又不断发生，疫区范围逐渐扩大。现将１９９０—１９９８年布病流行特点分析?
The first case of brucellosis (referred to as brucellosis) was found in 1954 in Zibo City, and was the first case after the founding of the People’s Republic of China in Shandong Province. After the active prevention and control, the world was free from the outbreak of epidemic and sick animals since 1985. However, since two cases of patients were found in 1989, the brucellosis epidemic continued to occur in Zibo and the area of affected areas gradually expanded. Now from 1990 to 1998 epidemic characteristics of brucellosis?