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      Development of proliferative kidney disease in rainbow trout, Oncorhynchus mykiss (Walbaum), following short-term exposure to Tetracapsula bryosalmonae infected bryozoans

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      Journal of Fish Diseases
      Wiley

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          Proliferative kidney disease of salmonid fish

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            Induction of proliferative kidney disease (PKD) in rainbow trout Oncorhynchus mykiss via the bryozoan Fredericella sultana infected with Tetracapsula bryosalmonae.

            Proliferative kidney disease (PKD) is a serious infection of wild and farmed salmonids, affecting mainly the kidney and spleen but becoming systemic in most susceptible fish hosts. This report deals with the transmission of Tetracapsula bryosalmonae Canning, Curry, Feist, Longshaw & Okamura 1999 from naturally infected bryozoans Fredericella sultana Blumenbach 1779 to naive rainbow trout Oncorhynchus mykiss Walbaum 1792, thereby confirming the recent conclusion based on partial 18S rDNA sequence data that bryozoans are hosts of the myxozoan parasite T. bryosalmonae (formerly PKX organism) that causes the disease. Parasite transmission using T. bryosalmonae spores was successful by short-term exposure to disrupted bryozoans known to contain T. bryosalmonae spores and T bryosalmonae sacs liberated from the bryozoans, and by long-term cohabitation with infected bryozoan colonies. Infection was confirmed by examination of kidney imprints, detection of the parasite in stained tissue sections, PCR using T. bryosalmonae-specific primers, and comparison of amplified 18S rDNA sequences from the bryozoans and experimentally infected fish. Transmission was not apparent, nor was PKD induced, in fish challenged by intraperitoneal injection of spores isolated from F. sultana.
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              Ribosomal DNA Sequence Analysis of Isolates of the PKX Myxosporean and Their Relationship to Members of the GenusSphaerospora

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                Author and article information

                Journal
                Journal of Fish Diseases
                J Fish Diseases
                Wiley
                0140-7775
                1365-2761
                August 2002
                August 2002
                : 25
                : 8
                : 443-449
                Article
                10.1046/j.1365-2761.2002.00353.x
                68bd85ae-fc8e-4635-b62f-b8f3b3d94c58
                © 2002

                http://doi.wiley.com/10.1002/tdm_license_1.1

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