Positive, negative, and neutral mutations during the evolution of coronaviruses like SARS-CoV-2 There are many<unk>  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<unk>  contribute to the continuation of the COVID-19 pandemic. Five SARS-CoV-2<unk>  have been designated as<unk>  of concern by the World Health Organization: the Alpha, Beta, Gamma, Delta, and Omicron<unk> .
Variants of SARS-CoV-2
SARS-CoV-2 Omicron variant
SARS-CoV-2 Epsilon variant
SARS-CoV-2 Delta variant
SARS-CoV-2 Eta variant
SARS-CoV-2 Mu variant
SARS-CoV-2 Lambda variant
SARS-CoV-2 Alpha variant