Abstract

Aggregatibacter actinomycetemcomitans is a gram-negative coccobacillus that is part of the usual flora of the oral cavity and is mainly associated with oral and dental pathology; however, in some cases, it has been isolated as the primary causative agent in systemic conditions such as infectious endocarditis, pneumonia, skin and soft tissue infections, and osteomyelitis. We present the case of a previously healthy patient who developed an invasive disease caused by Aggregatibacter actinomycetemcomitans with pulmonary involvement and fistulization to the chest wall, and the difficulties at the time of etiological diagnosis because it is a fastidious germ that is difficult to isolate.

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