A decent study on surgical mask effectiveness

They screened through a few thousand people to find 246 people who had viruses, then did a randomized controlled test of surgical masks. “Surgical face masks significantly reduced detection of influenza virus RNA in respiratory droplets and coronavirus RNA in aerosols, with a trend toward reduced detection of coronavirus RNA in respiratory droplets. Our results indicate that surgical face masks could prevent transmission of human coronaviruses and influenza viruses from symptomatic individuals.” | learn more