[mewzilla]

Effectiveness of N95 Masks against SARS-CoV-2: Performance Efficiency, Concerns, and Future Directions

Not to mention that masks are fomites.

[Elsie]

 

2.2.1. Face Masks

Face masks are loosely fitted devices that cannot avoid leakage around the mouth upon breathing. These are commonly made of single-layer fabrics including cotton, silk, chiffon, flannel, various synthetics, and their combinations; however, the efficiencies improved when multiple layers are used with a combination of fabrics. (63) They only provide a physical barrier against large respiratory droplets. (64) Usually, these devices are worn by suspected or confirmed COVID-19 patients to prevent the spreading of the droplets generated by the wearer in accordance with CDC recommendations. (65) However, they are not approved by NIOSH.

 

2.2.2. Surgical Masks

These are also loose-fitting and do not prevent leakage around the mouth upon inhalation. They are fluid-resistant and provide a physical barrier against body fluids and other hazardous fluids. They are not considered a form of respiratory protection. The FDA classified these masks as medical devices.