Five persons contracted tick-borne relapsing feverafter staying in a cabin in western Montana. Borrelia herm-sii was isolated from the blood of two patients, andOrnithodoros hermsi ticks were collected from the cabin,the first demonstration of this bacterium and tick inMontana. Relapsing fever should be considered whenpatients who reside or have vacationed in western Montanaexhibit a recurring febrile illness
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