Despite the exponential jump in the incidence of COVID-19 in Crimea and a serious increase in deaths from coronavirus infection and complications caused by it, there are still people who consider it unnecessary to wear protective masks. They are supported in this opinion by many experts, who claim that a mask is needed only for those who are already sick, so not to infect others. Recent studies by Western scientists and doctors refute these claims. The material was prepared based on publications from “Inopress”.