Detection of Salmonella Organisms from Carps, Trouts and Eels

Watanabe, Akinobu; Tokumaru, Masakazu; Kurisu, Masamitsu; Yanagawa, Keiko; Ikeuchi, Tomoko; Masaki, Hiroyuki

doi:10.3358/shokueishi.22.8

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“…It is important to search for the natural reservoir as well as a susceptible animal because the frequency of isolation of S. braenderup from enterocolitis patients is increasing rapidly in Japan (9). There are several reports in which S. braenderup was isolated from cultured eel and carp (25), turtles (4) and cows (15).…”

Section: Discussionmentioning

confidence: 99%

The 106‐Kilobase Plasmid of Salmonella braenderup and the 100‐Kilobase Plasmid of Salmonella typhimurium Are Not Necessary for the Pathogenicity in Experimental Models

Horiuchi

Goto

Inagaki

et al. 1991

Microbiology and Immunology

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Among 1,041 clinical isolates (77 serovars) of Salmonella which had been derived from cases with acute enterocolitis, 601 (58°)) contained one or more plasmids. Large serovar-specific plasmids were seen in 95 of 307 isolates (31%) of Salmonella typhimurium, in 34 of 34 isolates (100%) of Salmonella enteritidis and in 36 of 38 isolates (94.7%) of Salmonella braenderup: the sizes of which were 100, 60 and 106 kilobases (kb), respectively.In order to determine the role of these plasmids in pathogenicity for enterocolitis, the plasmids were eliminated from some strains of S. braenderup and S. typhimurium and the pathogenicity of the plasmid-less strains was compared with that of the parent strains by invasiveness to HeLa cells, fluid accumulation in the rabbit ligated ileal loop, lesion of mucosal tissue and the Sereny test. The virulence of all the plasmid-less strains was as strong as that of the plasmidbearing strains in these pathogenicity assay systems. We therefore concluded that the 106-kb plasmid of S. braenderup and the 100-kb plasmid of S. typhimurium are not necessary for their pathogenicity in the experimental models : invasiveness to HeLa cells, fluid accumulation in the rabbit ligated ileal loop, and Sereny test.

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Section: Discussionmentioning

confidence: 99%