Fig. 1.

Maximum-likelihood tree of Rickettsia spp. based on gltA sequences. Two sequences identified in this study are shown in red with bold accession numbers. Further sequences of Rickettsia spp. (representing major phylogenetic groups and having nearly 100% coverage with sequences obtained here) were retrieved from GenBank. Clades of RFG (Rickettsia felis group), SFG (spotted fever group) and TG (typhus group) are circled by dashed line filled with different colours. Species name, isolation source and country of origin are shown for each entry. Branch lengths represent number of substitutions per site, inferred according to scale shown.