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Ticks can transmit a wide variety of pathogens, including bacteria. Here, we report the detection of tick-associated bacteria in Chaiyaphum Province, northeastern Thailand. There have been few reports of tick-borne bacterial pathogens in the study areas, which are evergreen forests dominated by plateaus at elevations of approximately 1,000 m. In total, 94 ticks were collected from vegetation. They were screened for the presence of  Coxiella, Francisella, Rickettsia , and  Borrelia  bacteria using PCR assays. In this study, we found ticks from two genera,  Haemaphysalis  and  Amblyomma , that were positive for  Coxiella -like bacteria (CLB) and  Rickettsia .  Francisella  and  Borrelia  spp. were not detected in these two tick genera. The results revealed the evolutionary relationships of CLB in  Amblyomma testudinarium, Haemaphysalis lagrangei , and  Haemaphysalis obesa  ticks using the  16S  rRNA and  rpoB  markers, which clustered together with known isolates of ticks from the same genera. In contrast, the  groEL  marker showed different results. On the basis of the  groEL  phylogenetic analysis and BLAST results, three groups of CLB were found: (1) CLB from  A. testudinarium  grouped as a sister clade to CLB from  Ixodes ricinus ; (2) CLB from  Haemaphysalis lagrangei  was distantly related to CLB from  Haemaphysalis wellingtoni ; and (3) CLB from  A. testudinarium  grouped as sister clade to CLB from  Amblyomma  from French Guiana and Brazil. For  Rickettsia  studies, phylogenetic trees of the  gltA, ompB , and  sca4  genes revealed two groups of Spotted Fever Group (SFG)  Rickettsiae : (1) SFG  Rickettsiae  that formed a sister clade with  Rickettsia tamurae  AT-1 (belong to the  Rickettsia helvetica  subgroup) in  A. testudinarium  and (2) SFG  Rickettsiae  that formed a distantly related group to  Rickettsia rhipicephali  3-7-female6-CWPP (belong to the  Rickettsia massiliae  subgroup) in  A. testudinarium . This study expanded our knowledge of the diversity of tick-borne  Coxiella  and  Rickettsia  bacteria. The pathogenic roles of these bacteria also need to be investigated further.

Phylogenetic Studies of Coxiella-Like Bacteria and Spotted Fever Group Rickettsiae in Ticks Collected From Vegetation in Chaiyaphum Province, Thailand