Because measles is such a highly contagious disease, by the time several cases have been reported, it is likely that most susceptible individuals have been exposed and are incubating the disease.
英
美
释义
由于麻疹具有很高的传染性,因此在病例出现并被报告的时候实际上大部分敏感人群已经被感染并处于潜伏期中。
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