1. WHO, Enhancing readiness for Omicron (B.1.1.529): technical brief and priority actions for member states. https://www.who.int/docs/default-source/coronaviruse/technical-brief-and-priority-action-on-omicron.pdf?sfvrsn=50732953_3, 2021 (accessed 05 January 2022).
2. WHO, 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-(b.1.1.529)-sars-cov-2-variant-of-concern, 2021 (accessed 05 January 2022).
3. Heavily mutated omicron variant puts scientists on alert;Callaway;Nature,2021
4. WHO, Weekly epidemiological update on COVID-19 - 22 February 2022, https://www.who.int/publications/m/item/weekly-epidemiological-update-on-covid-19---22-february-2022, 2022 (accessed 25 February 2022).
5. UFBoot2: improving the ultrafast bootstrap approximation;Hoang;Mol. Biol. Evol.,2018