https://blog.wongcw.com/2020/09/09/%e6%96%b0%e5%86%a0%e7%97%85%e6%af%92%e6%ad%a3%e5%9c%a8%e7%99%bc%e7%94%9f%e7%aa%81%e8%ae%8a%ef%bc%8c%e9%82%a3%e7%96%ab%e8%8b%97%e9%82%84%e7%ae%a1%e7%94%a8%e9%ba%bc%ef%bc%9f/
新冠病毒正在發生突變,那疫苗還管用麼?