歐美世衛改口，口罩防疫到底有沒有科學依據
圖片版權 Getty Images Image caption 疫情爆發時，亞洲人戴口罩的比率較高。
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這只是商品推銷廣告，不可能有所謂瞬間包裹口腔和呼吸道內的細菌和病毒，通過代謝系統排出體外 ，正確的防疫做法仍然是配戴醫療口罩。在面對新流行病時選擇有限，很多人體內存在新冠病毒但沒有病症，戴口罩可以減少患者噴出帶有病毒的口水。
References
https://www.bbc.com/zhongwen/trad/science-52199529https://www.bbc.com/zhongwen/trad/science-52199529
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