A parvo-like virus in cultured redclaw crayfish Cherax quadricarinatus from Queensland, Australia
| Autor: | Angela Reid, Howard C. Prior, Elizabeth C. Kulpa, Rachel O Bowater, Kelly Condon, Max Wingfield, Andrew Fisk |
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| Rok vydání: | 2002 |
| Předmět: |
Pathology
medicine.medical_specialty Zoology Aquaculture Astacoidea Aquatic Science Inclusion Bodies Viral Parvovirus Cherax quadricarinatus medicine Animals Mortality In Situ Hybridization Ecology Evolution Behavior and Systematics Epizootic biology Decapoda Foregut Midgut biology.organism_classification Crayfish medicine.disease Immunohistochemistry Basophilic Microscopy Electron nervous system Ultrastructure Queensland |
| Zdroj: | Diseases of Aquatic Organisms. 50:79-86 |
| ISSN: | 1616-1580 0177-5103 |
| DOI: | 10.3354/dao050079 |
| Popis: | In the summer of 1999/2000, an epizootic occurred in cultured juvenile redclaw crayfish Cherax quadricarinatus on one commercial crayfish farm in northern Queensland, Australia. Mortalities occurred over 4 wk, with up to 96% cumulative mortalities in 2 earthen ponds stocked with juveniles. The crayfish were weak, anorexic and lethargic. A transmission trial was conducted, using filtered, cell-free extract prepared from infected crayfish as inoculum. The disease was reproduced, with on-going mortalities occurring in inoculated crayfish over 55 d. Experimentally inoculated crayfish showed gross signs of malaise, anorexia and disorientation before dying. Two types of intranuclear inclusion bodies (INIBs) were seen in tissues of endodermal, ectodermal and mesodermal origin by light microscopy with haematoxylin and eosin (H&E) stained sections. 'Early'-stage INIBs were eosinophilic, rounded and located centrally within slightly enlarged nuclei while 'late'-stage INIBs were well-rounded and deeply basophilic. The gills, cuticular epithelium and epithelial cells of the foregut, midgut and hindgut were the most heavily infected tissues. By transmission electron microscopy, virions with an average diameter of 19.5 nm were seen within electron-dense granular inclusion bodies within enlarged nuclei of both naturally and experimentally infected crayfish. The size of the virions and cytopathology are consistent with characteristics of viruses in the Family Parvoviridae. This is the first reported case of mass mortality caused by a parvo-like virus infection in C. quadricarinatus. |
| Databáze: | OpenAIRE |
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