Not that surprised N95 respirators significantly outperformed masks, but I am surprised that cloth masks were better at reducing exhaled SARS-CoV-2 virus compared to surgical masks! 😷
A duckbill N95 reduced exhaled viral load by 98% (95% CI: 97%–99%), and significantly outperformed a KN95 (p < 0.001) as well as cloth and surgical masks. Cloth masks outperformed a surgical mask (p = 0.027) and the tested KN95 (p = 0.014).