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The aim of these studies was to assess residual virulence and early protective capacity of a negatively markered live attenuated vaccine candidate Salmonella Enteritidis mutant against a highly virulent S. Enteritidis strain using a dayold chicken model. Nonflagellated FliD negative mutants of Salmonella Enteritidis 11 (SE11) with and without the virulence plasmid proved to be sufficiently attenuated (limited invasiveness in vitro/in vivo) without reduced ability to colonise chicken gut. The early protective activity of a nonflagellated, virulence-plasmidcured (fliD–, pSEVΔ) mutant against organ invasion, caecal colonisation and faecal shedding by the highly virulent challenge strain S. Enteritidis 147 NalR proved to be effective and safe. The innate and adaptive immunity was demonstrable during the first four weeks of life, and the serological response was clearly distinguishable from the response induced by the wild parental strain. In conclusion, we provided data for the first time about a virulence-plasmid-cured, nonflagellated mutant of S. Enteritidis to serve as a basis for development of a negatively markered potential live oral vaccine against virulent S. Enteritidis in chicken.

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virulence plasmids in the isolates from infected foals, dog and monkey. Onderstepoort J. Vet. Res. 68 ,105-110. Prevalence of virulent Rhodococcus equi in isolates from soil collected from 2 horse farms in South Africa and

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of virulent Rhodococcus equi based on restriction fragment length polymorphism of virulence plasmids: a molecular approach for epidemiology of virulent R. equi in the world. J. Clin. Microbiol. 37 , 3417-3420. Genetic

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766 Wood, M. W., Mahon, J. and Lax, A. J. (1994): Development of a probe and PCR primers specific to the virulence plasmid of Salmonella enteritidis. Mol. Cell Probes 8, 473

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plasmids and serotyping of Rhodococcus equi isolates from submaxillary lymph nodes of pigs in Hungary. J. Clin. Microbiol. 43 , 1246–1250. Takai S. Characterization of virulence

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31 489 498 Kim, J. F., Alfano, J. R.: Pathogenicity islands and virulence plasmids of bacterial plant pathogens. Curr Top Microbial Immunal 264/II

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, T. , Tsubaki, S. , Major, A. , Fodor , L. , Varga , J. and Takai , S. ( 2005 ): Characterization of virulence plasmids and serotyping of Rhodococcus equi isolates from submaxillary lymph nodes of pigs in Hungary . J. Clin. Microbiol. 43

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, P. Z. , Blum- Oehler , G. , Boldogkoi , Z. and Nagy , B. ( 2005 ): Characterization of an F18+ enterotoxigenic Escherichia coli strain from post weaning diarrhoea of swine, and of its conjugative virulence plasmid pTC . FEMS Microbiol. Lett

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Acta Microbiologica et Immunologica Hungarica
Authors: Serra Örsten, Selay Demirci-Duarte, Tuğçe Ünalan-Altıntop, Aslı Çakar, Banu Sancak, Koray Ergünay, and Cumhur Özkuyumcu

biological behaviour of the hvKp strains is partly mediated by genes on a large virulence plasmid or within chromosomal islands [ 13–17 ], some of these regions including mucoviscosity-associated gene A ( magA ), regulator of mucoid phenotype ( rmp ) A and A2

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Acta Microbiologica et Immunologica Hungarica
Authors: Fatima Bachir Halimeh, Rayane Rafei, Seydina Diene, Mary Mikhael, Hassan Mallat, Marcel Achkar, Fouad Dabboussi, Monzer Hamze, and Jean-Marc Rolain

(enteroinvasive E. coli ) share similar genetic (analogous virulence plasmid) and biochemical features [ 7 ]. Unlike E. coli , Shigella isolates are less active biochemically and react with limited set of antisera and shared with EIEC pathogenicity genes [ 8

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