Peter Krause has seen plenty of patients with Lyme disease. He has also seen his fair share of cases where classic symptoms suggest Lyme, but tests for the disease-causing bacterium, Barrelia burgdorferi, come back negative. The Yale tick-borne diseases expert now says that in some instances, a related and recently discovered disease may be to blame. Borrelia miyamotoi elicits symptoms similar to its better-known bacterial cousin with two trademark exceptions: Patients do not get a bull's-eye rash, and they come down with a fever in which the symptoms relapse and remit over the course of about a year.
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