Tickborne relapsing fever, Bitterroot Valley, Montana, USA

Emerg Infect Dis. 2015 Feb;21(2):217-23. doi: 10.3201/eid2102.141276.

Abstract

In July 2013, a resident of the Bitterroot Valley in western Montana, USA, contracted tickborne relapsing fever caused by an infection with the spirochete Borrelia hermsii. The patient's travel history and activities before onset of illness indicated a possible exposure on his residential property on the eastern side of the valley. An onsite investigation of the potential exposure site found the vector, Ornithodoros hermsi ticks, and 1 chipmunk infected with spirochetes, which on the basis of multilocus sequence typing were identical to the spirochete isolated from the patient. Field studies in other locations found additional serologic evidence and an infected tick that demonstrated a wider distribution of spirochetes circulating among the small mammal populations. Our study demonstrates that this area of Montana represents a previously unrecognized focus of relapsing fever and poses a risk for persons of acquiring this tickborne disease.

Publication types

  • Case Reports
  • Research Support, N.I.H., Intramural

MeSH terms

  • Animals
  • Anti-Bacterial Agents / therapeutic use
  • Borrelia
  • Humans
  • Male
  • Middle Aged
  • Montana / epidemiology
  • Relapsing Fever / diagnosis
  • Relapsing Fever / drug therapy
  • Relapsing Fever / epidemiology*
  • Relapsing Fever / transmission
  • Travel
  • Treatment Outcome

Substances

  • Anti-Bacterial Agents