中国复旦大学和澳洲悉尼大学合作进行的研究发现,当空气湿度低时,新冠病毒传播风险将会增加。研究被认为加强了大众戴口罩外出的必要性。
新冠肺炎疫情在全球肆虐,各国加强研究新冠肺炎病毒,寻找遏止其传播的方法。澳洲传媒9News报道,研究报告在英国杂志《越界传播与新现疾病》(Transboundary and Emerging Diseases)刊登,是澳洲有份的第2份关于天气情况与新冠肺炎之间联系的研究。
悉尼大学流行病学教授沃德(Michael Ward)表示,研究显示干燥天气对传播新冠肺炎病毒的影响,进一步反映湿度是传播一个关键因素,湿度每下降一个百分点,新冠肺炎病例便会增加7%至8%。
从生物学角度而言,当湿度愈低,空气更干燥,气溶胶(aerosols)便愈细小。而从打喷嚏和咳嗽产生的细小气溶胶一旦可以在空气停留更长时间,便会增加传播予其他人的风险;相反,空气潮湿会令气溶胶变得更大更重,于是更快掉落地上,从而减低传播能力。
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