Diagram displaying the lineages of SARS-CoV2.

The original genome lies at the centre of the branches, identified by a grey dot. Separate lineages have been identified within single VOCs, such as 21A, 21I and 21J in the Delta variant.

The labels are as follows, going from left to right: 21J Delta, Delta, 21I Delta, 21A Delta, Lambda, Beta, Alpha, Gamma, Omicron, BA.2 (21L), BA.1 (21K), Epsilon, Mu. Nextstrain.org