Table. 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
1	54-	M	July 30b	38.9°C–39.4°C temperature, rash, headache, myalgia, arathralgia	Spirochete negative	Seropositive by IFAc and Western blot
2	5	F	August 10	40.6°C temperature., vomiting, diarrhea, headache, myalgia	Spirochete positive	Mouse inoculation positive; isolation of B. hermsii
3	43	M	August 16	Fever, headache, myalgia, arthralgia	Spirochete positive	Mouse inoculation positive; isolation of B. hermsii
4	43	F	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