Before revision:  Here, we examine the relation between detectability of SARS-CoV-2 infection (i.e. the proportion of detected COVID-19 cases among all cases of  SARS-CoV-2 infection in the population ) and levels of mortality from COVID-19 for the 85 regions of the Russian Federation . Methods: Lower case-fatality ratio ( CFR, the proportion of deaths among all detected COVID-19 cases ) corresponds to higher detectability of the SARS-COV-2 infection .
After revision:  Here, we examine the relation between detectability of SARS-CoV-2 infection (i.e. the proportion of detected COVID-19 cases among all cases of SARS-CoV-2 infection in the population ) and levels of mortality from COVID-19 for the 85 regions of the Russian Federation on Oct. 1, 2020, every death for COVID-19 corresponds to 14.7 detected cases of COVID-19 in the population, while the corresponding number for the whole of Russia is 56.7, suggesting limited detection of mild/moderate cases of COVID-19 in St. Petersburg. Methods: More active testing for SARS-CoV-2 results in lower case-fatality ratio ( CFR, the proportion of deaths among all detected COVID-19 cases ) corresponds to higher detectability of the SARS-COV-2 infection .