Mask against the coronavirus, prevention against the viral epidemic. The surgical mask is a means of prevention against the risks of contamination of the coronavirus. This capsid virus is very contagious. It is transmitted from man to man thanks to the droplets of water expectorated during sneezing and speech. The mask helps block the spread of these droplets by people with the disease. During the COVID 19 epidemic that appeared at the end of 2019, the mask is recommended to stem the spread of the virus. Strasbourg, Bas-Rhin, France.