Gas masks can certainly prevent novel coronavirus pneumonia, but they are not recommended for personal protection. Even in healthcare facilities, places where secondary protection is recommended, such as wards and fever clinics, wearing protective clothing and N95 masks is sufficient. For places with operation, such as doing tracheoscopy, pharyngeal swab collection, respiratory endotracheal intubation, it may be necessary to wear eye masks and protective masks, and medical institutions with the conditions can wear a full-fledged hood for protection. Gas masks are costly and inconvenient to use. A disposable surgical mask is recommended. Emphasize that when wearing a mask, such as going out on public transportation, going to the hospital, etc., you need to wear a mask throughout the whole process, and can not be removed at will. Also pay attention to hand hygiene. If you are in contact with public areas and have not washed your hands, do not touch your mouth, nose, eyes and other parts of the body. Source: Dr. Yurai