SARS-CoV-2 Omicron variant
The Omicron variant (or B.1.1.529) is a form of SARS-CoV-2, the virus that causes COVID-19. It was first reported to the World Health Organization (WHO) from South Africa on 24 November 2021. On 26 November 2021, the WHO called it a variant of concern, and named it "Omicron".