香港新冠肺炎疫情持續，不少市民做足防疫措施保持社交距離，但最近美國有研究證實，新冠肺炎確診患者呼吸及說話時會釋出具傳染性的微飛沬，更可噴超過2米距離，隨時傳播病毒，換句話說，即使遵守2米社交距離都未必安全！
美國內布拉斯加大學（University of Nebraska）的研究團隊在5間新冠肺炎確診者的病房中，於離地約30cm的距離採集空氣樣本。確診者在說話或咳嗽時產生的微飛沫，可在空氣中懸浮數小時，亦即是外界俗稱的「氣霧」。團隊將收集所得的樣本放置培養皿，發現18個測試樣本中，竟有3個能夠自行再生複製。
研究結果發現，由體積小於5微米的微飛沫（microdroplet）中所取得的新型冠狀病毒可在實驗室中複製再生，證實不止咳嗽和打噴嚏，連患者呼吸和說話時釋出的微飛沬均具傳染性，當中病毒的感染劑量和可傳播的距離，更遠超過社交距離建議的2米。
內布拉斯加大學醫學中心助理教授Joshua Santarpia指出，因樣本能在細胞培養皿中複製代表具有傳染性，研究證明了微飛沫亦具有傳播病毒能力。該研究已上載到醫學論文平台medRxiv網站，但由於研究仍處於初步性結果，故未有刊登在經審查的期刊上。
其實早於本月底初多國科學家已聯署去信世界衛生組織，指有證據顯示新冠肺炎病毒可經空氣和氣溶膠傳播，直至7月7日世衛承認可經空氣和氣溶膠傳播的可能性。
來源：ndtv、The Straits Times、news24；圖片來源：pexels、unsplash
▼緊貼最新疫情消息▼
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