1. Harvey WT, Carabelli AM, Jackson B, Gupta RK, Thomson EC, Harrison EM, et al. SARS-CoV-2 variants, spike mutations and immune escape. Nat Rev Microbiol. 2021;19:409–24.
2. Konings F, Perkins MD, Kuhn JH, Pallen MJ, Alm EJ, Archer BN, et al. SARS-CoV-2 Variants of Interest and Concern naming scheme conducive for global discourse. Nat Microbiol. 2021;6:821–3.
3. World Health Organization. COVID-19 Weekly Epidemiological Update 22: Special edition: Proposed working definitions of SARS-CoV-2 Variants of Interest and Variants of Concern. World Health Organization. 2021. p. 1–4. https://www.who.int/docs/default-source/coronaviruse/situation-reports/weekly_epidemiological_update_22.pdf
4. World Health Organization. Tracking SARS-CoV-2 variants. WHO. 12 April 2022. https://www.who.int/en/activities/tracking-SARS-CoV-2-variants/
5. Centers for Disease Control and Prevention. SARS-CoV-2 Variant Classifications and Definitions. Centers for Disease Control and Prevention. April 2022. https://www.cdc.gov/coronavirus/2019-ncov/variants/variant-info.html
6. European Centre for Disease Prevention and Control. SARS-CoV-2 variants of concern as of 22 July 2021. European Centre for Disease Prevention and Control. 2021.
7. Campbell F, Archer B, Laurenson-schafer H, Jinnai Y, Konings F, Batra N, et al. Increased transmissibility and global spread of SARS- CoV-2 variants of concern as at June 2021. Eurosurveillance. 2021;26:1–6. http://dx.doi.org/10.2807/1560-7917.ES.2021.26.24.2100509
8. World Health Organization. COVID-19 Weekly Epidemiological Update. Edition 47 Published 6 July 2021. https://reliefweb.int/sites/reliefweb.int/files/resources/20210706_Weekly_Epi_Update_47.pdf
9. World Health Organization. Weekly Epidemiological Update on COVID-19 - 22 June 2021. Ed. 45. https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---22-june-2021
10. Boehm E. Kronig I, Neher RA, Eckerle I, Vetter P, Kaiser L. Novel SARS-CoV-2 variants: the pandemics within the pandemic. Clin Microbiol Infect. 2021; 27(8): 1109–1117. DOI: 10.1016/j.cmi.2021.05.022
11. Villiers CB de, Blackburn L, Cook S, Janus J. SARS-CoV-2 variants. UK: United; 2021. https://www.finddx.org/wp-content/uploads/2021/03/COVID-variants-report-FINAL-12MAR2021.pdf
12. Callaway E. Delta coronavirus variant: scientists brace for impact. Vol. 595, Nature. England; 2021. p. 17–8.
13. Lopez Bernal J, Andrews N, Gower C, Gallagher E, Simmons R, Thelwall S, et al. Effectiveness of Covid-19 Vaccines against the B.1.617.2 (Delta) Variant. N Engl J Med. 2021; https://doi.org/10.1056/NEJMoa2108891
14. World Health Organization. Classification of Omicron (B.1.1.529): SARS-CoV-2 Variant of Concern. https://www.who.int/news/item/26-11-2021-classification-of-omicron-%28b.1.1.529%29-sars-cov-2-variant-of-concern
15. Cov Lineage List. April 2022. https://cov-lineages.org/lineage_list.html
16. European Centre for Disease Prevention and Control. Weekly epidemiological update: Omicron variant of concern (VOC) – week 2 (data as of 13 January 2022) EU/EEA. 2022.
https://www.ecdc.europa.eu/en/news-events/weekly-epidemiological-update-omicron-variant-concern-voc-week-2-data-13-january-2022