日本理化学研究所于周二发表超级电脑“富岳”的模拟结果,表示食肆4人座餐桌被飞沫溅到风险最高者,是坐在患者邻座而非对面。研究所指,戴口罩防止正面而来的飞沫、邻座之间设隔帘是有效防疫对策,但亦要配合换气。
在食肆的模拟中,假设长1.2米、阔60厘米的餐桌两边各坐两人,并面向对方说话。结果发现,患者邻座的人距离更近,被溅到飞沫的机会,是坐在患者对面的5倍、斜对面的20倍;飞沫倾向沿直线传播,几乎不溅到说话对象以外的人。
理化学研究所也调查福岛县及岐阜县等地,发生集体感染的合唱风险,发现唱歌产生的飞沫是说话数倍,多人面向同一方向唱歌,产生涌向前排演奏者的气流。研究所指,使用透明胶口罩能抑制气流,减少人数可有效降低传染风险。
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