FIG 2.

Phylogenetic relationship of Rickettsia sp. Black Gap to other spotted fever group Rickettsia taxa determined using concatenated sequences of the rrs, gltA, sca0, sca5, and sca4 genes. Homologous sequence data for validated species of SFGR and Rickettsia felis were obtained from GenBank (www.ncbi.nlm.nih.gov/GenBank). The evolutionary history was inferred using the maximum likelihood method. Positions containing gaps or missing data were eliminated, leaving a total of 10,466 nucleotides in the final data set. The scale bar is in units of the number of base substitutions per site. Bootstrap values for 1,000 replicates are displayed at the nodes.