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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.
What are the Omicron subvariants, and how do they differ? The Omicron subvariants seem like an alphabet soup of letters and numbers. The original Omicron variant was called B.1.1.529 .
"Guidelines on the Treatment and Management of Patients with COVID-19". Infectious Diseases Society of America (IDSA). "Coronavirus Disease 2019 (COVID-19) Treatment Guidelines". National Institutes of Health. World Health Organization. Corticosteroids for COVID-19: living guidance, 2 September 2020 (Report). hdl: 10665/334125. WHO/2019-nCoV ...
No evidence has shown that BA.5 will cause more severe illness than previous omicron subvariants. Montefiori said it’s helpful to think of the immune system as having two lines of defense.
Scientists have warned that a coronavirus variant like omicron, which appears able to dodge some protective antibodies generated by the vaccines, could be a major setback in the pandemic.
The Omicron variant features as such for the first time in the overview of WHO's weekly operational update, namely "Supporting Omicron variant detection and COVID-19 response in southern Africa." As of 2 December, Botswana and South Africa have reported 19 and 172 Omicron variant cases, respectively, accounting for 62% of global cases.
The BA.4 and BA.5 omicron subvariants are now dominant in the U.S They pose a greater challenge to vaccine protection, but symptoms remain the same. There's a new omicron variant dominating the U.S.
In September 2023, the FDA approved an updated monovalent (single) component Omicron variant XBB.1.5 version of the vaccine (Comirnaty 2023–2024 formula) as a single dose for individuals aged twelve years of age and older; [30] and authorized the Pfizer-BioNTech COVID-19 Vaccine 2023–2024 formula under emergency use for individuals aged 6 ...