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Campylobacter is one of the emergingfoodborne pathogens, and its worldwide incidence rate isextremely high. This study was undertaken to isolate andidentify Campylobacter strains from chicken carcasses inthe local markets, and analyze their characteristics regardingoxygen tolerance. They were isolated after aerobic enrichmentand identified by biochemical, physiological, and morphologicalcharacteristics, PCR, and 16S rDNA sequencing. Theiroxygen tolerances were analyzed in terms of the celloxidoreductase. Five strains of C. jejuni were isolated andidentified from 61 isolates from 50 chickens. Amongthem, C. jejuni IC21 grew well in Brucella broth andcommercial milk under aerobic condition. However, in theaerobic exposure, the cell surface hydrophobicity of C.jejuni IC21 was almost the same as the other isolates, eventhough its morphology changed from the spiral-bacilliform into the coccoid form. Fatty acid analyses showedthat all Campylobacter strains had a high compositionof C19:1, cyclopropane fatty acid, and that the amount ofthe other faty acids were very similar between them.Interestingly, however, only oxidoreductase activities of C.jejuni IC21 increased highly under aerobic exposure eventhough its activities were almost the same as the other C.jejuni strains just after microaerobic culture. It had 11.8times higher catalase activity, 4.4 times higher for SOD, and2.0 times higher for NADH oxidase activities. Therefore,in the case of the aero-adaptive C. jejuni IC21, expressionof oxidoreductase significantly increased under oxidativestressed condition, which might allow it to survive for alonger time and grow on food under aerobic exposure.Such new strain might be one of the explanations for the

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