Can prevent respiratory infections to a certain extent. It can block pollutants such as droplets, blood, body fluids, secretions, etc., and has a certain effect on prevention. The protective effect is better than single-use medical masks. It is recommended that the general public include patients with suspected cases, passengers of the public transportation department, taxi drivers, sanitation workers, and service personnel in public places. This type of mask also protects the patient's wounds from contamination during surgery, providing medical personnel with basic isolation from blood and body fluid splashes.