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Key points People with COVID-19 have a wide range of symptoms ranging from mild symptoms to severe illness. Symptoms may appear 2-14 days after exposure to the virus. Symptoms may start as mild, and some people will progress to more severe symptoms. What are the symptoms of Omicron? How can it be treated? How long does this variant last? A complete overview by Ada’s Medical Knowledge Team. Omicron (B.1.1.529) is a variant of SARS-CoV-2 first reported to the World Health Organization (WHO) by the Network for Genomics Surveillance in South Africa on 24 November 2021. [10][11] It was first detected in Botswana and has spread to become the predominant variant in circulation around the world. [12] Following the original B.1.1.529 variant, several subvariants of Omicron have emerged including: BA.1, BA.2, BA.3, BA.4, and BA.5. [13] Since late October 2022, two subvariants of BA.5 ... Symptoms of omicron and its subvariants are similar, doctors say. They're all still Covid, and they can still cause severe disease.