Timeline of the SARS-CoV-2 Omicron variant

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The SARS-CoV-2 Omicron variant is a variant of concern of the SARS-CoV-2 virus, which causes COVID-19. The variant was first reported to the World Health Organization (WHO) from South Africa on 24 November 2021. It was designated as a variant of concern by the WHO on 26 November 2021.

24 November 2021: The Omicron variant is first reported to the WHO from South Africa.
26 November 2021: The WHO designates Omicron as a variant of concern and assigns it the Greek letter Omicron.

1 December 2021: The first confirmed case of the Omicron variant in the United States is reported in California.
3 December 2021: The first case of Omicron is detected in India.
10 December 2021: The United Kingdom reports its first death linked to the Omicron variant.
15 December 2021: The Omicron variant is detected in over 70 countries.

10 January 2022: The WHO reports that the Omicron variant is spreading significantly faster than the Delta variant in countries with documented community transmission.
20 January 2022: The Centers for Disease Control and Prevention (CDC) in the United States reports that Omicron has become the dominant variant in the country.

1 February 2022: The WHO states that the Omicron variant has been reported in 150 countries.
15 February 2022: Studies indicate that while Omicron is more transmissible, it may cause less severe disease compared to previous variants.

1 March 2022: The WHO continues to monitor the spread and impact of the Omicron variant globally.
15 March 2022: Research suggests that booster doses of COVID-19 vaccines provide significant protection against the Omicron variant.

1 April 2022: The Omicron variant remains the dominant strain in many parts of the world.
15 April 2022: Ongoing studies are conducted to understand the long-term effects of the Omicron variant on public health.

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