Based on the fineSTRUCTURE coancestry matrix visualized as a heatmap (Fig. 6), there appeared to be genetic exchange events occurring within and across each Legionella species, especially between Clades 2 and 3 but few events between Lp and other species. The color of each cell of the matrix indicated the expected number of genetic markers imported from a donor genome (x-axis) to a recipient genome (y-axis). Clade 3 species L. wadsworthii, L. cherri and L. dumoffii were admixed based on fineSTRUCTURE analysis (Fig. 6), although BAPS (Fig. 5) showed little evidence of DNA imports into these three genomes. All Legionella genomes in Clade 2 except L. maceachernii and L. micdadei showed signs of admixtures across all genomes in Clade 3 according to fineSTRUCTURE (Fig. 6), but BAPS analysis did not reveal any admixtures. The only sign of admixture predicted by BAPS analysis, excluding Clade 1, was between Clade 3 species L. anisa and L. bozemanii serogroup 2, which was also found by fineSTRUCTURE. Of the 25 Lp genomes in Clade 1, BAPS analysis revealed admixture signals in eight genomes: Lp1 Philadelphia, Lp LPE509, Lp 570-CO-H, and Lp3, Lp5, Lp11, Lp14 and Lp15. fineSTRUCTURE analysis also indicated small levels of admixtures across some Clade 1 genomes, which was not as evident as in BAPS.