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 (2019). Systemic infection in European perch with thermoadapted virulent Aeromonas salmonicida (Perca fluviatilis). Journal of fish diseases, 42(5), pp. 685-691. Wiley 10.1111/jfd.12970

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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.

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