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Lyme disease is caused by the bacterium Borrelia (B.) burgdorferi, which is transmitted through the bite of a deer tick. Both nymph and adult ticks can transmit B. burgdorferi. Risk Factors. Anyone exposed to deer ticks is at risk for Lyme disease.
Borrelia rarely causes life-threatening illness, but it can make you desperately miserable for a lifetime. There are 20 known species of Borrelia that can cause human illness (not just Borrelia burgdorferi), and it is not uncommon for people with Lyme disease to harbor at least two species.