The reason is that the influenza virus mutates much more rapidly than most other viruses.A person who develops immunity to one strain of the virus is not well protected from a different strain.
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释义
这是由于流感病毒比大部分病毒的基因变异都要快,一个人即使对一类流感病毒产生了免疫,也未必能抵御另外一种流感病毒。
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