At least 10 recent studies across the world proved that universal masking is essential in controlling the spread of SARS Cov-2 and thereby preventing Covid-19 infection. The experimental and epidemiologic data reportedly established the prevention benefit of masking in individual and community levels. The researchers have also established the efficacy of multi-layer cloth masks which block large as well as 50-70 percent  fine droplets and particles called aerosols. They also found that there are no significant adverse health effects for wearers including aged people and COPD patients.