Actinobacillus actinomycetemcomitans, an organism associated with rapidly destructive periodontal disease (periodontitis), is a rare cause of endocarditis in children. This report presents a case of A. actinomycetemcomitans endo carditis in a 6-year-old child with rapidly destructive periodontal disease. A leukotoxic antigen was documented in the strain of A. actinomycetemcomitans isolated from the patient's blood.
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