美科學家：抗疫別靠疫苗 最好追蹤隔離勤洗手

<img src="https://static.rti.org.tw/assets/thumbnails/2020/04/08/1dccf942dc31321b93d007fa741cd98b.jpg" width="360" alt="勤洗手。(pixabay圖庫)" title="勤洗手。...