How effective is face mask against COVID-19 if you’re the only one wearing it?

Shruti Gohil, MD, associate medical director of epidemiology and infection prevention at UCI Health, told Verywell that Omicron highlights the importance of mask use because the variant appears more contagious and it’s able to replicate more efficiently in the upper airway than other strains. Covering the nose and mouth can help prevent viral particles from entering the body, she said. … Gohil said that if people wear a mask when they’re sick, their risk of spreading COVID-19 to other is reduced significantly.