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Variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) are viruses that, while similar to the original, have genetic changes that are of enough significance to lead virologists to label them separately. SARS-CoV-2 is the virus that causes coronavirus disease 2019 (COVID-19). Some have been stated, to be of particular importance due to their potential for increased transmissibility,[1] increased virulence, or reduced effectiveness of vaccines against them.[2][3] These variants contribute to the continuation of the COVID-19 pandemic.
As of August 2024,[update] no variants are designated as circulating variants of concern by the World Health Organization.[4]
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