β-Lactamases producing anaerobic bacteria in dentoalveolar abscesses

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Pus samples of 30 patients with closed dentoalveolar abscesses who had not received antimicrobial therapy for at last two months were screened for the presence of β-lactamase-producing anaerobic bacteria. From these 30 pus samples, a total of 112 bacterial strains were isolated; 83 of them were strict anaerobes and 29 were aerobes. β-lactamases activity of the selected anaerobic bacteria was tested after identification of the isolates and was detected in 5 of the total 83 (6 %) strict anaerobic isolates, whereas these 5 strains were isolated in 4 of the 30 (13.3 %) pus samples. The species with β-lactamase activity were in the Prevotella intermedia (4 from 14 isolates) and the Fusobacterium nucleatum (1 from 9 isolates) groups. None of the gram-positive and the other gram-negative anaerobic strains were β-lactamase positive. (J. Oral Sci., 41, 187-190, 1999)