Before revision:  Conclusions: Regions of the Russian Federation with relatively low detectability of the SARS-CoV-2 infection (e.g. those regions for which the case-fatality ratio is below the median value of 1.2\% for the case-fatality ratio for COVID-19 in the different regions of the Russian Federation on Oct. 1, 2020 4 ) ought to increase testing for the  SARS-CoV-2 infection in order to mitigate the spread of the SARS-CoV-2 infection and diminish the related mortality.
After revision:  Conclusions: Regions of the Russian Federation with relatively low detectability of the SARS-CoV-2 infection (e.g. those regions for which the case-fatality ratio is below the median value of 1.2\% for the case-fatality ratio for COVID-19 in the different regions of the Russian Federation on Oct. 1, 2020 4 ) ought to increase testing for the factors that affects the levels of mortality from COVID-19. To increase detectability, one ought to test all individuals with respiratory symptoms seeking medical care for SARS-CoV-2 infection in order to mitigate the spread of the SARS-CoV-2 infection and diminish the related mortality.