1. WHO Coronavirus (COVID-19) Dashboard. Published 2022. https://covid19.who.int/table. (Accessed August 1, 2022).
2. WHO, Tracking SARS-CoV-2 variants. Published 2022. https://www.who.int/en/activities/tracking-SARS-CoV-2-variants. (Accessed July 31, 2022).
3. Heavily mutated coronavirus variant puts scientists on alert;Callaway;Nature,2021
4. Classification of Omicron (B.1.1.529): SARS- CoV-2 Variant of Concern,2021
5. The significant immune escape of pseudotyped SARS-CoV-2 variant Omicron;Wang;Emerg Microbes Infect,2022