A qualitative and quantitative bacteriological study was performed on pus specimens otained by needle aspiration of 50 acute dento-alveolar abscesses. Most samples contained a mixture of species (average 3·3); 20 (40%) of the abscesses contained anaerobes alone, 3 (6%) contained facultative anaerobes only and the remaining 27 (54%) contained mixtures of both types of bacteria, with anaerobes predominating. In total, 166 bacterial strains were isolated, 75% of which were strictly anaerobic; the most common species were spp, and . Among facultative anaerobes, was particularly common. The mean concentration of bacteria in each abscess was 10. The mean concentration of anaerobic bacteria was 10 and of facultatively anaerobic bacteria 10.


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