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Ailes, E., Demma, L., Hurd, S., Hatch, J., Jones, T. et al.: Continued decline in the incidence of Campylobacter infections, FoodNet 1996–2006. Foodborne Pathog. and Dis. 5 (3), 329–337 (2008

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. , Dingle , K. E. , Dawkins , M. S. and Maiden , M. C. ( 2008 ): Campylobacter infection of broiler chickens in a freerange environment . Environ. Microbiol. 10 , 2042 – 2050

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The association between putative virulence genes in Campylobacter jejuni clinical isolates, in vitro invasive capability and severity of infection is yet to be clearly described. We have characterized three virulence genes and correlated their presence with the severity of infection and in vitro invasiveness. We studied eight C. jejuni strains isolated from patients whose clinical data were scored to determine severity of infection. Cytolethal distending toxin (cdtB) , invasion associated marker (iam) and Campylobacter invasion antigen (ciaB) genes were detected by PCR and INT407 cells used for invasion assays. Two strains positive for all three genes were the most invasive and isolated from patients with the most severe infection. Four strains positive for two genes and two strains negative for all the three genes were identified. The two cdtB + ve / ciaB + ve strains were more invasive than the cdtB + ve / iam + ve strains. One of the cdtB ve / ciaB ve strains showed invasion levels similar to cdtB + ve / ciaB + ve strains, but the second strain had a non-invasive phenotype. The findings indicate a correlation between in vitro invasive capability, and the presence of all three genes. The pattern of association between invasiveness and molecular characterization suggests that the ciaB gene confers a more invasive capability.

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Wassenaar, T. M., Blaser, M. J.: Pathophysiology of Campylobacter jejuni infections of humans. Microbes Infect 1 , 1023-1033 (1999). Pathophysiology of Campylobacter jejuni

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Altekruse, S. F., Stern, N. J., Fields, P. I. and Swerdlow, D. L. (1999): Campylobacter jejuni — An emerging foodborne pathogen. Emerg. Infect. Dis. 5 , 28

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Acta Veterinaria Hungarica
Authors: Orsolya Erdősi, Katalin Szakmár, Zsuzsanna Szili, Géza Szita, Sándor Bernáth, József Sövényi, and Péter Laczay

Campylobacter spp. from foods . J. Appl. Microbiol. 89 , 884 – 891 . Chon , J. W. , Kim , H. , Yim , J. H. , Park , J. H. , Kim , M. S. and Seo , K. H. ( 2013 ): Development of

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Altekruse, S. F., Stern, N. J., Fields, P. I. and Swerdlow, D. L. (1999): Campylobacter jejuni — an emerging foodborne pathogen. Emerg. Infect. Dis. 5 , 28

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–804. 16 Hald, B., Skovgård, H., Bang, D., et al.: Flies and Campylobacter infection of broiler flocks. Emerg. Infect. Dis., 2004, 10 (8), 1490–1492. 17

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. I. and Garcia, M. M. (1995): A detection assay for Campylobacter fetus in bovine semen by restriction analysis of PCR amplified DNA. Vet. Res. Commun. 19 , 253–263. Garcia M. M

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): Comparison of two agar dilution methods and three agar diffusion methods, including the E-test, for antibiotic susceptibility testing of thermophilic Campylobacter species. Clin. Microbiol. Infect. 5, 580584. Comparison of two agar

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