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Lyme disease is an infection caused by a kind of bacteria (germ) called a spirochete. This bacterium, Borrelia burgdorferi, is transmitted by the bite of an infected deer tick. It is the most common tick-borne infection in both North America and Europe. Diagnosis is based on a variety of symptoms, physical findings, blood tests, and a history of exposure to infected ticks. The June 20, 2007, issue of JAMA includes an article that discusses a rash called erythema migrans (see below) as a clinical sign that is consistent with a diagnosis of early Lyme disease and other related tick-borne diseases.

SYMPTOMS

• Erythema migrans (EM)—About 70% to 80% of infected individuals will develop a red rash at the site of the tick bite. Over a period of days to weeks, the rash grows larger and the center may fade, creating a "bull's-eye" or ring appearance. The rash rarely may burn or . . . [Full Text of this Article]

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