National Center of Infectious and Parasitic Diseases, Sofia, Bulgaria
Communication on the spread of SARS-CoV-2 variants in the country 14 July 2023

The NCIPD has successfully analyzed 94 clinical samples with SARS-CoV-2 by next-generation whole genome sequencing. The samples were collected from patients with COVID-19 from 13 regions of the country in the period 28.04-25.05.2023 and were sent by 8 medical facilities.

Omicron and its subvariants were detected in all samples, including: XBB.х 51 (54.3%) and 43 (45.7%) other subvariants.

Pangolin COVID-19 Lineage Assigner v4.3. program was used to define SARS-CoV-2 variants. An epidemiological analysis is being carried out.

For information on the classification of SARS-CoV-2 variants and sub-variants, please visit: https://cov-lineages.org/index.html
For an up-to-date classification of the variants of concern (VOC), please visit:
https://www.ecdc.europa.eu/en/covid-19/variants-concern
https://www.who.int/en/activities/tracking-SARS-CoV-2-variants/

The NCIPD continues to monitor the spread of SARS-CoV-2 in the country, with a focus on VOC, altered virulence and immunogenicity that are of increased public health importance.