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Lyme disease, the multisystem infectious disease caused by the tick-borne spirochete Borrelia burgdorferi, causes a broad variety of peripheral nerve disorders, including single or multiple cranial neuropathies, painful radiculopathies, and diffuse polyneuropathies. Virtually all appear to be varying manifestations of a mononeuropathy multiplex. Diagnosis requires that the patient should have had possible exposure to the only known vectors, Ixodes ticks, and also have either other pathognomonic clinical manifestations or laboratory evidence of exposure. Treatment with antimicrobial regimens is highly effective. The mechanism underlying these neuropathies remains unclear, although interactions between anti-Borrelia antibodies and several peripheral nerve constituent molecules raise intriguing possibilities. Muscle Nerve 28: 133–143, 2003 [ABSTRACT FROM AUTHOR]