Abstract
The evolution of the new covid-19 virus has caused a much higher number of cases than estimated, so, one by one, the countries around the world where the virus appeared, have taken various measures to prevent its spread. These measures consisted in avoiding social contact; banning gatherings in crowded places, many companies have implemented online working from home, educational institutions have adopted online teaching, as well. Another measure adopted to prevent the spread of the virus was the obligation to wear a protective mask both indoors, in buses, shops, medical offices, as well as outdoors, in areas with a high percentage of infected people (bus stations, parkings, on the street).

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