Extended Data Fig. 1. A maximum-likelihood-based phylogenetic tree of 334 representative SARS-CoV-2 sequences belonging to the B.1.617 lineage.

GISAID ID, country of exposure, and sampling date were noted in each terminal node. The country isolated (India, the UK, or other countries) and the PANGO sublineage are indicated by the text colour, as indicated in the figure. Coloured circles on the branch are shown on internal nodes for which the bootstrap value was ≥ 80 (red) or ≥ 50 (blue) (n = 1,000).