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dc.contributor.authorRomero, Xavier-
dc.contributor.authorTurnbull, James-
dc.contributor.authorJimenez, Roberto-
dc.description.abstractA study of the ultrastructural characteristics of an intracellular bacterium infecting the redclaw crayfish, Cherax quadricarinatus, a pathogen referred to previously as a rickettsia-like organism (RLO), revealed the presence of different developmental stages. These included a rod-shaped and uniformly electron-dense elementary body (EB) and an intermediate body (IB). The length of the EB varied between 0.48 and 0.6 microm, and the diameter was 0.3 microm. The IB was 0.75 to 1.1 microm long by 0.36 to 0.44 microm in diameter. Although the EB of this bacterium has ultrastructural characteristics similar to those of Rickettsiella, no information is available regarding its genetic relationship to this genus, and the intracellular bacterium should continue to be referred to as a rickettsia-like organism. The hemocytes had different levels of infection, and the RLO proliferated inside these cells. The EB appeared to be free in the cytoplasm of infected hemocytes and other cells; however, this might be a fixation artifact. The EB was also contained in membrane-bound vacuoles along with the IB. RLO colonies were observed inside small granular cells. No large granular cells were observed in the sections examined; therefore, no data were obtained regarding infection of this type of hemocyte. The fixed phagocytes on the external side of the terminal hepatic arterioles had an activated interrupted layer containing RLO bacteria. Stem cells in the hematopoietic tissue were also infected, and some cells were apparently being released into circulation.en_UK
dc.relationRomero X, Turnbull J & Jimenez R (2000) Ultrastructure and cytopathology of a rickettsia-like organism causing systemic infection in the redclaw crayfish, Cherax quadricarinatus (Crustacea: decapoda), in Ecuador, Journal of Invertebrate Pathology, 76 (2), pp. 95-104.-
dc.rightsThe publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.-
dc.subjectCherax quadricarinatusen_UK
dc.subjectrickettsia-like organismsen_UK
dc.subjectintracellular bacteriaen_UK
dc.subjectfixed phagocytesen_UK
dc.subject.lcshFish culture-
dc.titleUltrastructure and cytopathology of a rickettsia-like organism causing systemic infection in the redclaw crayfish, Cherax quadricarinatus (Crustacea: decapoda), in Ecuadoren_UK
dc.typeJournal Articleen_UK
dc.rights.embargoreasonThe publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work.-
dc.citation.jtitleJournal of Invertebrate Pathology-
dc.type.statusPublisher version (final published refereed version)-
dc.contributor.affiliationUniversity of Stirling-
dc.contributor.affiliationAcuatecnos CIA Ltd-
Appears in Collections:Aquaculture Journal Articles

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