 The region with both the highest COVID-19 mortality rate per 100, 000 and the highest CFR (lowest detectability of SARS-CoV-2 infection) is the city of St.
<clarity>  The region with both the highest COVID-19 mortality rate per 100, 000 and the highest CFR (lowest detectability of SARS-CoV-2 infection) is the city of St.
 For several regions of the Russian Federation, particularly the city of St.