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据纽约时报报导, 专家研究初步报告新冠变异B.1.1.7 传染35-45%更快40%-60% 更致命。为防止新冠变异快速传染,欧洲政府从一月起强制要求在公共场合佩戴高过滤医用级口罩。
从新冠去年一月爆发一年来,口罩市场高速发展,从初期的全面短缺到近期的泛滥,质量参差不齐。从2020四月开始,美国疾控中心(CDC)测验了数百种口罩。从测验总结可以看到,有些口罩效力极差,只有20-30%过滤效率,远低于有真正的保护效果要求的95%过滤效率。
传统大牌3M和Honeywell的KN95及N95在测验中如预期表现良好. 同时Chengde, Weini, 和 Powecom 的 KN95 口罩测验结果达到更高的99%过滤效率。KN95 类因高过滤保护性能,质地舒适,低呼吸阻力,易讲话,比布口罩和普通三层医用型口罩更适合大众。选择购买口罩请先查询CDC检验报告,确认至少过滤95%的0.3微米细小颗粒物。它们往往在空气中悬浮的最持久,很容易被吸入。 疾控中心同时强调口罩的佩戴方式也是非常重要的。佩戴口罩之前应该洗手或使用免洗手消毒液。用口罩遮住口鼻,调整鼻梁条夹紧,固定在下巴下方,尽量减少周边呼吸空气泄露。![](https://cdn.shopify.com/s/files/1/0267/0673/9255/files/cdc_summary_3_480x480.jpg?v=1610253668)
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