227 is the number of cases of the Omicron variant of Covid-19 registered in Bulgaria after whole genome sequencing at the National Centre of Infectious and Parasitic Diseases. The clinical samples were taken in the period up until 10 January, 2022 at 40 medical establishments in 18 regions of the country.

The Omicron cases registered are distributed as follows: Sofia-city – 130, Ruse – 28, Burgas – 13, Plovdiv – 13, Pernik – 7, Veliko Turnovo – 5, Pazardzhik – 5, Varna – 4, Sofia region – 4, Gabrovo – 3, Sliven – 3, Blagoevgrad – 2, Kyustendil – 2, Montana – 2, Pleven – 2, Smolyan – 2, Stara Zagora – 1, Haskovo – 1.

43.5% of the 522 clinical samples of Covid-19 have been proven to be of the Omicron variant, and 56.75% of the Delta variant or one of its sub-variants.