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July 22, 2021
Uncategorized

美研究飛沫懸浮可逾8分鐘  講話都恐助長疫情

美國研究人員指出,感染新冠狀病毒疾病的患者說話時產生的飛沫,可在空氣中滯留超過8分鐘之久,無形中恐助長疫情擴散。

國家衛生研究院(National Institutes of Health)和賓州大學研究人員的最新估計,只消在密閉空間大聲講話1分鐘,就會產生至少1000個可挾帶新型冠狀病毒的飛沫微粒。

根據「國家科學院學報」(PNAS)12日刊出的研究顯示,這些飛沫能在空氣中滯留超過8分鐘,而其他報告則指出,這樣長的時間足以讓吸入飛沫的人染疫。為進行實驗,研究人員讓一個人對著模擬封閉、不流通空氣環境的設備,重複喊著「保持健康」(Stay Healthy);選擇這個詞彙有其目的,因為th的尾音能讓受試者有效地產生飛沫。

研究人員利用雷射監看受試者飛沫從口中噴出後的情形,發現大滴口水變小的同時,可能已汽化並懸浮於空氣裡。研究人員基於觀察得出結論,在實際生活中這類微粒恐被其他人吸入,進而產生更多感染患者。

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