Before revision:  Petersburg . Conclusions: Detectability of SARS-CoV-2 infection is one of the factors that affects levels of mortality from COVID-19 . Regions of the Russian Federation with relatively low detectability of  SARS-CoV-2 infection (e.g. those regions for which  case-fatality ratio is below the median value of 1.2\% for the case-fatality ratio in different regions of the Russian Federation on Sep. 17 , 2020 [ 3 ])
After revision:  Petersburg , detectability of SARS-CoV-2 infection is one of the factors that affects levels of mortality from COVID-19 . Regions of the Russian Federation with relatively low detectability of SARS-CoV-2 infection (e.g. those regions for which case-fatality ratio is below the median value of 1.2\% for the case-fatality ratio in different regions of the Russian Federation on Sep. 17 , 2020 [ 3 ])