Some regions will cross the threshold of an epidemic at the end of December, said Russia's former sanitary doctor Gendi Oyshchenko. In an interview with RIA Novosti, he noted that the mask regime in the country is not mandatory, but in case of illness, it is better to use a mask to prevent the spread of the virus. Earlier, Rogerbondor reported that the incidence of influenza in the country continues to increase. Among the cases identified were flu and Hong Kong. Photo: Ladya Sharlskaya.