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A total of 341 strains of Clostridium were isolated from the feces of mice, rats, hamsters and rabbits. These isolates were identified with their physiological and biochemical characteristics. Isolates from mice and rabbits were identified at high rates to species level, 79.4% and 76.5%, respectively. But isolates from rats and hemsters were low rates, being 25.4% and 28.6%, respectively. The common species isolated from the faeces of laboratory animals were as follows : C. cocoides, C. coeatum and C. innocuum from mice; C. Cocleatum, C. cochlearium and C. irregularis from rats ; C. Coleatum and C. irregularis, from hamsters ; and C. aminovalericum and C. irregularis, from rabbits. Unidentified Clostridum spp. that did not have characteristics of know species were tentatively classified to 26 groups.
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