新冠疫苗:我們是不是需要不斷打加強針? - BBC News 中文
為什麼有些傳染病的疫苗接種一次可以終生免疫,而有些則需要經常補加強針?
為什麼有些傳染病的疫苗接種一次可以終生免疫,而有些則需要經常補加強針?
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