The genomic and clinical features of the COVID-19 Omicron variant: a narrative review

Coronavirus disease 2019 (COVID-19) has been a major cause of morbidity and mortality worldwide since December 2019. Up to July 2022, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) has infected more than 570 million people and contributed to the death of more than 6.4 million individuals around the world. Intriguingly, after more than