Fig. 2
From: The origins and genomic diversity of American Civil War Era smallpox vaccine strains
Maximum likelihood phylogenetic analysis of historical vaccine strains in relation to other OPXVs. a Position of the VACV clade and Mütter Museum vaccination strains within a broader OPXV phylogeny rooted using Ectromelia (ECTV) as an outgroup. b Position of the Mütter Museum vaccination strains within the phylogeny of available VACV strains, rooted using VACV Tashkent KM044310 as an outgroup. Nodes with > 95% bootstrap support are indicated with asterisks. All horizontal branch lengths are scaled according to the number of nucleotide substitutions per site