... problematic vaccine 问题疫苗 nanny blacklist 保姆黑名单 E11 新兴11国 ...
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The inactivated virus vaccine does not have this side effect, but multiple doses are required in order to provide protection which may prove problematic in endemic areas.
灭活病毒疫苗没有此种副作用，要提供保护则需要多剂量，但在流行地区这可能证明是难以解决的。
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