世衛：正在分析與監控Omicron2個亞變種BA.4和BA.5

<img src="https://static.rti.org.tw/assets/thumbnails/2021/12/05/0720088f799970042c747ead4d8e7961.jpg" width="360" alt="世衛組織已將Omicron變異株的原始亞變種BA.1的姐妹亞...