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Systemic infection in European perch with thermoadapted virulent Aeromonas salmonicida ( Perca fluviatilis )
Author(s) -
Rupp Melanie,
Pilo Paola,
Müller Barbara,
Knüsel Ralph,
Siebenthal Beat,
Frey Joachim,
Sindilariu PaulDaniel,
SchmidtPosthaus Heike
Publication year - 2019
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/jfd.12970
Subject(s) - aeromonas salmonicida , virulence , biology , perch , microbiology and biotechnology , aeromonas , aquaculture , type three secretion system , plasmid , vibrionaceae , fishery , bacteria , fish <actinopterygii> , virology , gene , genetics
Abstract In non‐salmonid fish, Aeromonas salmonicida can cause local infections with severe skin ulcerations, known as atypical furunculosis. In this study, we present a systemic infection by a virulent A. salmonicida in 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.