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１９９８年江苏省发生伤寒病人５０６２例，死亡１人，发病率为７．２３／１０万，病死率为０．０２％，疫情分布在１０７个县（市、区），８个县（市、区）无病人。发病率比１９９７年下降２０．９３％，发病地区减少２．７３％，是１９７７年以来发病率最低的一年。但是由?
In 1998, 5062 typhoid fever patients were found in Jiangsu Province, with a death rate of 7.23 / 100 000 and a case fatality rate of 0.02%. The outbreaks were distributed in 107 counties (cities and districts) and 8 counties (cities, District) no patient. The incidence rate dropped 20.93% from 1997 and the incidence in the area decreased by 2.73%, the lowest incidence since 1977. But by?