FIG 2.

An SNP-based maximum-likelihood phylogram of S. Senftenberg. A zoom-in view of the phylogenetic tree of S. Senftenberg isolates from China and poultry-persistent isolate SS209 is shown. The scale given represents the substitutions per variable site. The colors of the isolate designations indicates the locations from which the isolates were recovered. Color-coded information for each isolate is shown on the right and includes phylogenetic clade, year of isolation, structural patterns of SPI-1, SPI-2, and SPI-13, and the biochemical feature. The SC1 clade includes the newly emerged atypical non-hydrogen sulfide (H₂S)-producing isolates and, except for S11192, shared deletions in SPI-1 and SPI-2. The SC2 clade includes H₂S-producing isolates and is characterized by intact SPI-1 and SPI-2.