疫苗與群體免疫:一根針如何救你一命 - BBC News 中文 | 群體免疫 | 打針 | 防疫

接種疫苗真有必要嗎?沒病打針能治病?其實,要疫苗發揮防疫救人功效,還需要實現群體免疫(herd immunity)。BBC給您介紹其過程。

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