日本、欧洲近年都有过,MMR只要一放松监管,马上几年以后就传染爆发。
回答: Amish 社区拒绝接受measles vaccine , 都有好几次measles outbreak 了。另外,我们省,去年有
由 betadine
于 2015-12-27 11:25:04
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