fish viral diseases
DESCRIPTION
FISH VIRAL DISEASES. VIRUS MUST HAVE HOST TO SURVIVE AND REPLICATE. VIRION. SOME HAVE ADDITIONAL LIPID GLYCOPROTEIN COAT. Size of particles. VIRUS TYPES. DNA HERPESVIRUS, IRIDOVIRUSES RNA RABDOVORUSES, RETROVORUSES. Effects of Virus Infection. Histological changes CPE -. - PowerPoint PPT PresentationTRANSCRIPT
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FISH VIRAL DISEASES
• VIRUS MUST HAVE HOST TO SURVIVE AND REPLICATE
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VIRION
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• SOME HAVE ADDITIONAL LIPID GLYCOPROTEIN COAT–
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Size of particles
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VIRUS TYPES
• DNA –
• HERPESVIRUS, IRIDOVIRUSES
• RNA –
• RABDOVORUSES, RETROVORUSES
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Effects of Virus Infection
• Histological changes– –
• CPE -
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Host Response/Outcome
• No clinical disease – –
• Clinical disease– – –
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MANAGEMENT OPTIONS FOR VIRUSES
• AVOID– –
• VACCINATE
• REDUCE RISKS– –
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DNA viruses -Herpes group
• Channel catfish virus (CCV)
• Oncorhynchus masou virus (OMV)
• Walleye herpesvirus (WHV)
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DNA - Iridovirus
• Lymphocystis Disease - LDV
• Atlantic Cod Iridovirus
• Viral Erythrocytic Necrosis -VEN
• White Sturgeon Iridovirus
• Viral Erythrocyte Inclusion BodySyndrome - EIBS
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Channel catfish virus
• Acute disease • • Clinical signs
– – –
• Diagnosis–
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Erythrocytic Inclusions
• VEN– –
• No Red Blood Cells–
• Diagnosis–
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EIBS
• First detected spring Chinook salmon LWS hatchery 1982. Hematocrits 2 - 50%
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RNA viruses Rhabdoviruses
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• IHNV – Infectious hematopoietic necrosis virus
• VHSV – Viral Hemorrhage septicemia virus
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IHNV• Originated as three strains in Western North American
salmonids –
• • Signs
– – –
• Diagnosis– – –
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Strains and Virulence
• Single stranded RNA genome that encodes five structural proteins.
• Other factors affecting Virulence– – –
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Attenuated Virus
• Nan Scott Lake and Hagerman strains (multiple passages)
• Vaccines– –
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IHNV Control Methods
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VHSV- Viral Haemorrhagic Septicemia Virus
• Described in RBT in Denmark 1949
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VHSV• Signs
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• Diagnosis–
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Marine Reservoir for Pacific Northwest Isolates
• Herring Stocks affected severely – – – –
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Birnaviridae - IPNV
• Infectious Pancreatic Necrosis– – –
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IPN• Signs
– – – – –
• Diagnosis– – –
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IPNV
• Inactivated by chlorine and iodine
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DI - DEFECTIVE INTERFERING PARTICLES
• GENOME DEFFECTIVE– – – –