1. World Health Organization. Classification of Omicron; 2021. Available from: https://www.who.int/news/item/26-11-2021-classification-of-omicron-(b.1.1.529)-sars-cov-2-variant-of-concern. Accessed January 22, 2022.
2. World Health Organization. Enhancing response to Omicron SARS-CoV-2 variant; 2021. Available from: https://www.who.int/docs/default-source/coronaviruse/2021-12-23-global-technical-brief-and-priority-action-on-omicron.pdf?sfvrsn=d0e9fb6c_8. Accessed January 22, 2022.
3. World Health Organization. Enhancing response to Omicron SARS-CoV-2 variant; 2022. Available from: https://www.who.int/docs/default-source/coronaviruse/2022-01-07-global-technical-brief-and-priority-action-on-omicron---corr2.pdf?sfvrsn=918b09d_26. Accessed January 22, 2022.