Aggregatibacter actinomycemcomitans pneumonia in children: two case reports and a review of the literature.

Aggregatibacter actinomycemcomitans, previously named Actinobacillus actinomycetemcomitans (Aa), is a facultative Gram-negative slow-growing coccobacillus associated with severe oral and nonoral infections. It is a member of the HACEK group. Pulmonary infection caused by Aa is rare. We describe two cases of Aa pneumonia mimicking malignancy and review published pediatric cases.