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自１９９０年以来，云南省已连续开展了全省性和省内局部地区强化免疫活动１７轮次，累计口服脊髓灰质炎（脊灰）疫苗人数达３５９０．３１８万人。１９９７年１２月及１９９８年１月，按卫生部要求再次组织开展了２轮强化免疫活动。本地儿童和外地儿童报告服苗率均在９５％以上。两轮服苗工作结束后，云南省和日本国际协力事业团（ＪＩＣＡ）中国控制脊灰项目有关专家，应用服苗率快速评估的方法，对云南省昆明等７个地区（州、市）部分县的服苗率进行了评估，共调查９０９人。通过评估，调查服苗率与报告服苗率有较大差距，外地流动儿童服苗率比本地儿童低，在外地流动儿童中，“零”剂次免疫儿童仍占较大比例。
Since 1990, Yunnan Province has continuously carried out 17 rounds of intensified immunization activities in the whole province and in parts of the province, accumulating 35,903,181 oral poliomyelitis (polio) vaccines. In December 1997 and January 1998, two rounds of intensified immunization activities were organized again at the request of the Ministry of Health. Local children and children in the field reported that the rate of seedlings was more than 95%. After the work of two rounds of service and service was completed, experts from Yunnan Province and Japan International Cooperation Agency (JICA) China Polio Control Program applied the rapid assessment of the rate of the rate of the rate of the rate of the rate of the rate of the disease to the seven regions (state and city) such as Kunming in Yunnan Province. Dressing rate of the county has been assessed, a total of 909 people surveyed. Through the assessment, the surveyed rate of service-taking and the rate of reported service-taking have a big gap, and the rate of children’s MCH in other cities is lower than that of local children. Among the floating children in the Mainland, “zero” dose-immunized children still account for a large proportion.