On November 26, 2021, the World Health Organization (WHO) classified a new COVID-19 variant, B.1.1.529, as a Variant of Concern and has named it Omicron. No cases of this variant have been identified in the U.S. to date. CDC is following the details of this new variant, first reported to the WHO by South Africa.
According to WHO, the strain may spread more quickly than other forms. It has a large number of mutations. WHO said that preliminary evidence suggests an increased risk of reinfection with this variant as compared to other variants. WHO also said that current PCR tests continue to successfully detect the variant.