If once infected, such patients should first be isolated, during the isolation period to prevent further spread to the surrounding environment for, or should wear a mask to prevent droplets, or respiratory over the droplet infection to the outside. Medical staff working in the ward should wear the best protection masks, currently for the normal population without infection, in prevention, as long as not around the source of the disease, there is no need to bring N95 masks, in fact, it is recommended that the community put N95 masks to the front-line health care workers and real patients. As for normal prevention, it is usually enough to bring disposable masks or medical ordinary masks. Because if you are not around the pathogen, and the surrounding environment is not full of germs or viruses, it is actually more important to be aware of physical contact infections as long as you guard against droplets. Source: Dr. Yurai