Fig 4. Maximum likelihood phylogenetic tree of Rickettsia and Coxiella 16S rRNA gene sequences (248–301 bp).

GenBank accession numbers, species identifications, and isolates, with tick or vertebrate host species and country of origin in brackets, are indicated for each sequence. Sequences from this study are bolded. Bootstrap values at the major nodes are of percentage agreement among 1000 replicates. The branch length scale represents substitutions per site. The gaps indicated in the branches to the Coxiella and Rickettsia clades represent 0.10 substitutions per site.