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Lyme Disease, caused by the spirochete Borrellia burgdorferi, is the most common vector-borne
disease in the United States. Clinically, it primarily affects the skin, joints, nervous system, and heart.
Lyme carditis occurs in 4%-10% of adults with
Lyme disease. Transient variable-level atrioventricular blocks, occurring in 77% of adults with
Lyme carditis, are the most common cardiac manifestation. Up to 50% of
Lyme carditis patients may develop complete heart block. The incidence of
Lyme carditis in the pediatric population is not well established. We present a pediatric patient with a transient asymptomatic complete heart block resulting from
Lyme carditis, an under-recognized complication of
Lyme disease in the pediatric population.