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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.
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]
January 22. On January 22, the U.S. passed 25 million cases, with one of every 13 Americans testing positive for COVID-19. [24] January 24. On January 24, the Capitol Police announced that 38 police officers have tested positive for COVID-19 since the January 6 riot at the United States Capitol. [25] January 25.
The new guidance cuts the quarantine time from a previously recommended 10 days, which the CDC said was in preparation for an anticipated increase in Omicron cases.
It’s not yet clear, but some early data suggests people might become contagious sooner than with earlier variants — possibly within a day after infection. The U.S. Centers for Disease Control ...
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As time went on, the evolution of SARS-CoV-2's genome (by means of random mutations) led to mutant specimens of the virus (i.e., genetic variants), observed to be more transmissible, to be naturally selected. Notably, both the Alpha and the Delta variants were observed to be more transmissible than previously identified viral strains. [13]
A Qatar study that has yet to be peer reviewed found that people who had a pre-Omicron COVID infection had about a 28% protection against BA.4 or BA.5. A prior Omicron infection, however, offered ...