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Volume 9, Number 9—September 2003

Tick-borne Relapsing Fever Caused by Borrelia hermsii, Montana

Tom G. Schwan*Comments to Author , Paul F. Policastro*, Zachary Miller†, Robert L. Thompson†, Todd Damrow‡, and James E. Keirans§
Author affiliations: *Rocky Mountain Laboratories, National Institutes of Health, Hamilton, Montana, USA; †Group Health Cooperative of Puget Sound, Seattle, Washington, USA; ‡Department of Public Health, State of Montana, Helena, Montana, USA; §Georgia Southern University, Statesboro, Georgia, USA

Main Article


Summary of relapsing fever patients exposed in western Montana during July–August, 2002

Case no. Patient age (y)a Sex Onset Signs/Symptoms Initial blood smear Final laboratory results
July 30b
38.9°C–39.4°C temperature, rash, headache, myalgia, arathralgia
Spirochete negative
Seropositive by IFAc and Western blot
August 10
40.6°C temperature., vomiting, diarrhea, headache, myalgia
Spirochete positive
Mouse inoculation positive; isolation of B. hermsii
August 16
Fever, headache, myalgia, arthralgia
Spirochete positive
Mouse inoculation positive; isolation of B. hermsii
August 30
38.9°C–39.4°C temperature, vomiting, diarrhea, headache
Spirochete negative
Mouse inoculation negative; no isolation
5 13 M August 11 40.6°C temperataure, vomiting, headache Spirochete positive Mouse inoculation and isolation not attempted

aConfirmed cases with demonstration of spirochetes in blood; presumptive cases with appropriate manifestations but no spirochetes detected.
bThis patient relapsed on August 6.
cIFA, immunofluoresence assay

Main Article

Page created: January 03, 2011
Page updated: January 03, 2011
Page reviewed: January 03, 2011
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