Gauze masks have a certain protective effect, merely able to protect the human respiratory organs from harmful substances such as vapors or large particles, and can be used as a kind of respiratory organ protection equipment, protection against vapors or larger dust particles, etc.. But if you want to use it in the defense of this new coronavirus pneumonia, the effect is really not very good. The material of gauze masks is not tight enough and the pore size is very large. It is best to buy medical surgical masks from a regular pharmacy or from a hospital during the prevention period because medical surgical masks can be very good at preventing viruses and droplet transmission. Medical masks have clearer and more standardized requirements for liquid transmission or for permeability. Usually should be appropriate to do sports as much as possible to enhance their own immunity, even if the encounter of a very small amount of virus is not infected or morbidity, to be able to reduce viral infections, as far as possible to reduce outdoor activities, more ventilation, hand washing and so on. Source: Dr. Yurai