After the occurrence of the new coronavirus, the transmission pathway has droplet transmission and contact transmission, to block the discharge of secretions from the infected person through a mask, or by wearing a mask to block the inhalation of foreign objects, mucous membrane contact with the virus. General masks are divided into several types, single-use medical masks, medical surgical masks, N95, 3M, medical ambulance masks for different groups of people. General single-use masks recommended for use in non-personnel-intensive public places; medical surgical masks protective effect is higher than the single-use medical masks, recommended for suspected cases, public transportation drivers and passengers, cab drivers, sanitation workers, public places of service personnel on duty during the matching; N95 particulate protective masks protection effect is better, recommended for on-site investigations, sampling and testing personnel, public personnel in the personnel High-density intensive places or closed occasions can also be worn; general medical protective masks recommended for fever outpatient isolation ward of medical staff and diagnosed patients to wear when transferring. The protective effect of different masks has a degree of difference, but the protective effect is the same. General medical masks have three layers, generally the outermost layer is a waterproof layer, the middle of the toxic particles or viruses have adsorption effect of electrostatic isolation layer, the most inside is called the comfort layer, is a layer of skin protection gauze. You can choose the appropriate mask according to the degree of your condition, the space you are in and your occupation. Content source: Dr. Yurai