世界卫生组织（WHO）已批准多种COVID-19疫苗用于紧急使用，这些疫苗基于多种平台，例如mRNA疫苗、灭活病毒疫苗、蛋白亚单位疫苗和腺病毒载体疫苗。

Explainer - With the national flu immunisation programme starting on 1 April, there's still a little confusion about what may ...

The COVID-19 pandemic will be remembered as one of the most seminal periods for anyone who lived through that world wide ...