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随着改革开放的不断深入，流动人口不断增加，其中儿童数量也在增加，这部分儿童给计划免疫工作带来一定的困难，主要问题有以下几个方面。１ 流动人口处于不稳定状态，不接受免疫或免疫中断的现象时有出现。仅１９９６年脊灰糖丸免疫日就发现流动儿童１２８人，其中零次剂免
With the continuous deepening of reform and opening up, the floating population is on the increase. The number of children in this area is also on the increase. Some of these children have brought certain difficulties to the planned immunization work. The main problems are as follows. 1 The floating population is unstable and does not accept immunization or immune disruptions. Only polio sugar pills in 1996 immunization day found that 128 children were floating, of which zero-one dose-free