Cloth masks are effective against a virus with a droplet based spread, like the flu. When an infected person sneezes or coughs, cloth face masks can contain th

Cloth masks are effective against a virus with a droplet based spread, like the flu. When an infected person sneezes or coughs, cloth face masks can contain those droplets as they spray out. With an airborne virus you have to be able to filter the air people are breathing and a cloth face mask that isn't even fitted tightly to the face just cannot do that. This is why you need an n95 mask or better fitted tightly enough to your face to create an air seal. For example, the Measles also has an airborne spread and the OSHA requirements for medical professionals mandate gloves, eye and face protection, and respiratory protection. https://www.osha.gov/measles/control-prevention https://www.osha.gov/measles/control-prevention Note that Flu levels hit record lows globally while Covid continued to spread like wildfire. >CDC says seasonal flu cases hit record lows around the world https://www.nbcnews.com/health/cold-and-flu/cdc-says-seasonal-flu-cases-hit-record-lows-around-world-n1240333 https://www.nbcnews.com/health/cold-and-flu/cdc-says-seasona...