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There are many variants of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes coronavirus disease 2019 (COVID-19). Some are believed, or have been stated, to be of particular importance due to their potential for increased transmissibility, increased virulence, or reduced effectiveness of vaccines against them. These variants contribute to the continuation of the COVID-19 pandemic.

Five SARS-CoV-2 Variants have been designated as variants of concern by the World Health Organization: the Alpha, Beta, Gamma, Delta, and Omicron variants.[1]


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