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Fatal Lyme Carditis in New England: Two Case Reports

Background: Lyme disease is the most common vectorborne disease in the United States, and it is hyperendemic in the Northeast (1). In the United States, the spirochete Borrelia burgdorferi causes Lyme disease and is transmitted by the bite of an infected black-legged tick. Carditis is a rare manifestation that can usually be treated successfully with a short course of antibiotics (2). However, it can present with many symptoms, and its severity can change rapidly and unpredictably (3). Death can occur when Lyme carditis is untreated. LETTERS