SARS-CoV-2 lineage B.1.617

[1] It first came to international attention in late March 2021 after the newly established INSACOG performed genome sequencing on positive samples throughout various Indian states.

[2] Lineage B.1.617 later came to be dubbed a double mutant by news media.

Not all sublineages of B.1.617 share the same mutations: The first B.1.617 genome sequence was submitted to GISAID in fall 2020 according to one source.

[12] The team at PANGO behind manually curating the phylogenetic tree of SARS-CoV-2 noted the earliest sequence was from 7 December 2020.

[13] They revised the phylogenetic tree to include three sublineages of B.1.617 on 21 April 2021 after noticing that not all genome sequences being assigned by the PANGOLIN tool contained the same set of mutations.