a mask for filtration to prevent covid infection. -19 or for protection against n95 dust - reduces exposure to wearer particles

aerosol aerosols anxiety background breath care carrier case contaminated contract corona coronavirus covid covid19protection disease doctor droplets dust epidemic exposure face factor filtering filtration fine flu health hospital hygienic ill illness infection influenza large lock mask medical medicine n95 novel pandemic particle particles person pollution prevent prevention protection protective quarantine reduces risk safety safty sick sickness small sneeze spread strain surgical transmission treatment virus wearer wearers white