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Systemic infection in European perch with thermoadapted virulent Aeromonas salmonicida (Perca fluviatilis)
- Rupp, Melanie, Pilo, Paola, Müller, Barbara, Knüsel, Ralph, von Siebenthal, Beat, Frey, Joachim, Sindilariu, Paul‐Daniel, Schmidt‐Posthaus, Heike
- Journal of fish diseases 2019 v.42 no.5 pp. 685-691
- Aeromonas salmonicida, Cyprinidae, Lepomis macrochirus, Perca fluviatilis, cold-water fish, furunculosis, genes, perch, plasmids, recirculating aquaculture systems, temperature, toxicity testing, type III secretion system, virulence
- In non‐salmonid fish, Aeromonas salmonicidacan cause local infections with severe skin ulcerations, known as atypical furunculosis. In this study, we present a systemic infection by a virulent A. salmonicidain European perch (Perca fluviatilis).This infection was diagnosed in a Swiss warm water recirculation aquaculture system. The isolate of A. salmonicida encodes a type three secretion system (TTSS) most likely located on a plasmid similar to pAsa5/pASvirA, which is known to specify one of the main virulence attributes of the species A. salmonicida. However, the genes specifying the TTSS of the perch isolate show a higher temperature tolerance than strains isolated from cold‐water fish. The function of the TTSS in virulence was verified in a cytotoxicity test using bluegill fry and epithelioma papulosum cyprinid cells.