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Three cases of
disease with cardiac involvement are reported. One patient had myocarditis complicated by symptomatic complete AV block and two patients had asymptomatic 1st degree AV block. There were no abnormalities on echocardiography. The cardiac changes occurred between the 18th and 40th day after the onset of the
disease and persisted 10 days: however these conduction defects may vary within a few hours. A rapid and complete cure was obtained with antibiotic therapy.