Distribution and molecular characteristics of rickettsiae found in ticks across Central Mongolia

Bazartseren Boldbaatar, Rui Ruo Jiang, Michael E. Von Fricken, Sukhbaatar Lkhagvatseren, Pagbajab Nymadawa, Bekhochir Baigalmaa, Ya Wei Wang, Benjamin D. Anderson, Jia Fu Jiang, Gregory C. Gray

Research output: Contribution to journalArticlepeer-review

29 Scopus citations


Background: Little is known regarding tick-borne diseases in Mongolia, despite having 26% of the population still living nomadic pastoral lifestyles. A total of 1497 adult unfed ticks: 261 Ixodes persulcatus, 795 Dermacentor nuttalli, and 441 Hyalomma asiaticum, were collected from three ecologically distinct regions in Central Mongolia. Tick pools (n = 299) containing ~5 ticks each, were tested for Rickettsia and Tick-borne encephalitis virus (TBEV) using nested polymerase chain reaction, reverse transcription-PCR, and quantitative real-time RT-PCR. Results: Assays yielded pooled prevalence of 92.5% (49/53) and 1.9% (1/53) for pooled I. persulcatus testing positive for "Candidatus Rickettsia tarasevichiae" and TBEV, respectively, while Rickettsia raoultii was found in 72.8% (115/158) of pooled D. nuttalli samples. When calculating a maximum likelihood estimation, an estimated 46.6% (95% CI: 35.2-63.6%) of I. persulcatus ticks in the pooled sample were infected with "Candidatus R. tarasevichiae". Conclusions: Both "Candidatus R. tarasevichiae" and R. raoultii are recognized as emerging tick-borne pathogens, with this being one of the first reports of "Candidatus R. tarasevichiae" in Mongolia. Given that "Candidatus R. tarasevichiae" shares the same vector (I. persulcatus) as TBEV, and infections may present with similar symptoms, Mongolian physicians treating suspected cases of TBEV should include "Candidatus R. tarasevichiae" infection in their differential diagnosis and consider prescribing antimicrobial therapy.

Original languageEnglish (US)
Article number61
JournalParasites and Vectors
Issue number1
StatePublished - Feb 2 2017
Externally publishedYes


  • Ixodes persulcatus
  • Mongolia
  • Rickettsia

ASJC Scopus subject areas

  • Infectious Diseases
  • General Veterinary
  • Parasitology


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