Figure 2.

Molecular Phylogenetic analysis by Maximum Likelihood method based on Rickettsia spp. ompA partial sequences. Sequences from current study are marked in bold. The evolutionary history was inferred by using the Maximum Likelihood method based on the Kimura 2-parameter model. The tree with the highest log likelihood (−864.84) is shown. The percentage of trees in which the associated taxa clustered together is shown next to the branches. Initial tree(s) for the heuristic search were obtained automatically by applying Neighbor-Join and BioNJ algorithms to a matrix of pairwise distances estimated using the Maximum Composite Likelihood approach, and then selecting the topology with superior log likelihood value. A discrete Gamma distribution was used to model evolutionary rate differences among sites (5 categories (+G, parameter = 0.5571)). The tree is drawn to scale, with branch lengths measured in the number of substitutions per site (next to the branches). The analysis involved 40 nucleotide sequences. Codon positions included were 1st+2nd+3rd+Noncoding. All positions containing gaps and missing data were eliminated. There were a total of 186 positions in the final dataset. Evolutionary analyses were conducted in MEGA7.