The live-attenuatedvaccine is considered the most effective, but there is a worry: what might happen once these viruses wake up?
减毒活疫苗被认为是最有效的，但有一个问题：一旦这些病毒苏醒，会发生什么？
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Measles vaccine is a live attenuatedvaccine, vaccination against measles virus can stimulate the body to generate antibodies that protect the body from infection.