Succinate accumulation in pig large intestine during antibiotic-associated diarrhea and the constitution of succinate-producing flora.

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Succinate was the major organic acid detected in the hindgut content of pigs suffering from antibiotic-associated diarrhea. Antibiotic-associated diarrhea was induced by an oral dose of polymyxin B sulfate (3,000,000 units/day) or an intramuscular injection of enrofloxacin (0.6 g enrofloxacin/day). In the large intestine of enrofloxacin-treated pigs, Gram-negative facultative anaerobic rods phylogenetically related to Escherichia coli and Gram-positive facultative anaerobic non-spore-forming rods phylogenetically related to Lactobacilli were isolated as succinate producers. Succinate-producing Lactobacilli were only isolated as the succinate producer in polymyxin B sulfate-treated pigs. In contrast to antibiotic-associated diarrhea pigs, bacteria belonging to Bacteroidaceae, Fusobacteria, and Enterobacteriaceae were detected as succinate producers in a non-treated pig. In antibiotic-associated diarrhea conditions, antibiotic-resistant Enterobacteria, E. coli in particular, and Lactobacilli may contribute to an abnormal succinate accumulation and may affect water absorption in the hindgut that relates to an expression of antibiotic-associated diarrhea.

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