Fig. 2

Maximum likelihood tree of Rickettsia strains based on four loci (3729 bp in total). Bootstrap support is color-coded as illustrate in the legend and based on 5000 replicates. Rickettsia group naming follows [3], as does naming of the strains. Briefly, most names correspond to Rickettsia hosts, and lowest available taxonomic rank is provided. Rickettsial species are named ‘Rickettsia‘ and environmental samples are labeled with ‘(env)’. For collapsed parts of the tree, the number of terminal nodes are parenthesized. Novel sequences are marked with red triangles and each is labeled with host species name, lab ID, and an abbreviation indicating sampling location and sampling date (separated with underscore). See Additional file 1: Table S1 for full information on all samples