Meanwhile, among the diseases of mumps, the proporation of schoolmates after MMR vaccine ascended to 50% from 20% before MMR vaccine.
同时接种后腮腺炎病例中，学生比例由接种前的20%增加到50%；
Meanwhile, among the diseases of mumps, the proporation of schoolmates after MMR vaccine ascended to 50% from 20% before MMR vaccine.
同时接种后腮腺炎病例中，学生比例由接种前的20%增加到50%；
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