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答:发病率高的因素主要有三点:①传染源广泛存在:典型菌痢患者多能住院隔离治疗.而轻型、非典型病人多不住院治疗,自由活动、散布病菌.恢复期病人带菌率高达20%左右,慢性菌痢病人排菌期又可长达数年之久.由于这些传染源不能得到控制,势必造成菌痢的不断流行.②传播途径很多:城市居民以食物传播、生活接触传播为主.农村水源污染、苍蝇传播较广泛.痢疾杆菌在水果、蔬菜及腌菜中能生存10日左右,在奶类中生存约20日,当温度适应时大量繁殖。如吃不干净的
A: The high incidence of three main factors: ① widespread sources of infection: typical dysentery patients can be more hospitalized isolated treatment, while patients with mild, atypical cases are not hospitalized, free movement, spread of bacteria. Convalescent patients with up to rate About 20%, Chronic bacillary dysentery patient row period can be as long as several years.Because these sources of infection can not be controlled, is bound to cause the continuous epidemic of dysentery.② There are many routes of transmission: urban residents to food communication, contact life spread Mainly in rural water pollution, flies spread more widely. Shigella in fruits, vegetables and pickles can survive about 10 days, about 20 days in the milk, when the temperature adapt to a large number of breeding. If not clean