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Background  To date, 6 tick-borne rickettsiae pathogenic for humans are known to occur in Africa and 4 of them were first identified in ticks before being recognized as human pathogens.    Results  We examined 33 and 5  Amblyomma tholloni  ticks from African elephants in the Central African Republic and Gabon, respectively, by PCR amplification and sequencing of a part of  gltA  and  ompA  genes of the genus  Rickettsia . The partial sequences of  gltA  and  ompA  genes detected in tick in Gabon had 99.1% similarity with those of  R. heilongjiangensis  and 97.1% with those of  Rickettsia  sp. HL-93 strain, respectively. The partial  gltA  and  ompA  gene sequences detected in tick in the Central African Republic were 98.9% and 95.1% similar to those of  Rickettsia  sp. DnS14 strain and  R. massiliae , respectively. Phylogenetic analysis showed  Rickettsia  sp. detected in Gabon clusters with  R. japonica  and  R. heilongjiangensis  in a phylogenetic tree based on the partial  gltA  and  ompA  genes. The genotype of the  Rickettsia  sp. detected in the Central African Republic is close to those of  R. massiliae  group in the phylogenetic tree based on partial  gltA  gene sequences, and distantly related to other rickettsiae in the tree based on partial  ompA  gene.    Conclusion  The degrees of similarity of partial  gltA  and  ompA  genes with recognized species indicate the rickettsiae detected in this study may be new species although we could only study the partial sequences of 2 genes regarding the amount of DNA that was available. We propose the  Rickettsia  sp. detected in Gabon be provisionally named " Rickettsia sp . stain Davousti" and  Rickettsia  sp. detected in the Central African Republic be named " Rickettsia sp.  strain Uilenbergi".

Detection of "Rickettsia sp. strain Uilenbergi" and "Rickettsia sp. strain Davousti" in Amblyomma tholloni ticks from elephants in Africa