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给大家举个例子，来了解英国所谓的“群体免疫”
source link: https://www.v2ex.com/t/654872
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英国 - @omowyh - 英国人把兔子带到没有天敌的澳大利亚，导致兔子大量繁殖，泛滥成灾。为了解决兔子太多的问题，又引入一种病毒，使兔子感染，产生传染病。开始时兔子大量死亡，最终剩下一小部分抵抗力强的兔子活了下来，这一小部分兔
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