The results show that a standard surgical and three-ply cloth masks, which see current widespread use, filter at apparent efficiencies of only 12.4% and 9.8%, respectively. Apparent efficiencies of 46.3% and 60.2% are found for KN95 and R95 masks,
前面說要甚麼學術研究的 台灣現在絕大部份人戴的口罩 保護效果遠比疫苗差
英國打AZ跟BNT面對印度變種 防止有症狀的保護力是67跟88% 防重症保護力兩家都是90多%
口罩防護率才多少?也不能防重症
誰還在鼓吹不打疫苗靠戴口罩就好?
Kito love wrote:
HEPA擋不住病毒口(恕刪)









































































































