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Campylobacter jejuni is a major cause of food borne pathogens in humans and a major reservoir for this pathogen is poultry. The C. jejuni in broilers was investigated from in the caeca of broilers. Twenty broiler/flock samples from 7 flocks were assessed. The average prevalence of C. jejuni was 65% in the broiler flocks. The adhesion and invasion ability of 48 strains of C. jejuni on INT 407 were studied. The adhesion and invasion ability of 48 Campylobacter isolates from caecal contents were analyzed with Human embryonic intestine (INT-407) cells being used as a gentamicin resistance assay. The caecal isolates exhibited a wide range of adherence and invasion ability. There was a significant correlation (p&lt;0.01) between the adherence and the invasion ability of the Campylobacter isolates. Each of the virulence-associated genes: dnaJ, cadF, pldA and ciaB was detected by polymerase chain reaction from 100, 76, 31 and 41% of the Campylobacter strains, respectively. All of four virulence-associated genes were detected in 11 isolates. However, there was unclear association between the invasion ability and the presence of virulence-associated genes in this experiment, suggesting that more genes may be involved in the invasion process.

journal of veterinary medical science

PCR Detection of Four Virulence-Associated Genes of Campylobacter jejuni Isolates from Thai Broilers and Their Abilities of Adhesion to and Invasion of INT-407 Cells