Delta變種肆虐 美過去7天確診增10%

<img src="https://static.rti.org.tw/assets/thumbnails/2020/12/09/dd72c934ee3c72d88bc0b813f775376c.jpg" width="360" alt="美國疾病管制暨預防中心（CDC）主任瓦倫斯基(Rochell...