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依照時間替換或是避免說話的情況都不正確，台北醫學大學附設醫院胸腔內科主治醫師徐上富指出，口罩只要打噴嚏或是沾到唾液後，細菌就會在上頭滋生，不斷接觸到口鼻反而會生病，因此必須馬上更換。
References
https://tw.news.yahoo.com/口罩該戴多久-網曝-x小時-就得換-052514467.htmlhttps://tw.news.yahoo.com/口罩該戴多久-網曝-x小時-就得換-052514467.html
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