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| Piscirickettsia salmonis | |
|---|---|
| Name | Piscirickettsia salmonis |
| Domain | Bacteria |
| Phylum | Proteobacteria |
| Classis | Gammaproteobacteria |
| Ordo | Thiotrichales |
| Familia | Piscirickettsiaceae |
| Genus | Piscirickettsia |
| Species | P. salmonis |
Piscirickettsia salmonis
Piscirickettsia salmonis is a Gram-negative bacterial pathogen of teleost fishes first described in intensive aquaculture settings in Chile, Norway, Canada, and the United Kingdom. It causes systemic infection known as piscirickettsiosis or Salmonid Rickettsial Septicaemia, affecting salmonid aquaculture and prompting responses from industry regulators like the Food and Agriculture Organization and national agencies such as the Ministry of Agriculture (Chile), Department of Fisheries and Oceans (Canada), and Marine Scotland. The pathogen has driven research collaborations among institutions including the University of Chile, University of Bergen, University of British Columbia, and private companies in the aquaculture sector.
Originally isolated and described by researchers working in Chilean salmon farms, P. salmonis was classified within the phylum Proteobacteria and placed in the class Gammaproteobacteria and order Thiotrichales, family Piscirickettsiaceae. Taxonomic studies have involved comparisons with genera such as Francisella, Coxiella, Rickettsia, and Legionella to resolve relationships using 16S rRNA, multilocus sequence analysis, and phylogenomic frameworks developed at institutions including the National Center for Biotechnology Information and the European Molecular Biology Laboratory. Debates over species boundaries have referenced rules from the International Code of Nomenclature of Prokaryotes and proposals discussed at meetings of the International Committee on Systematics of Prokaryotes.
Cells are small, non-motile, pleomorphic rods or coccoid forms observed within host macrophages and in cell culture systems used by laboratories such as the Fisheries and Oceans Canada diagnostic facilities. Microscopy studies using protocols from the American Society for Microbiology and imaging centers at universities like University of Edinburgh reveal an intracellular lifestyle with envelopes typical of Gram-negative bacteria, including an outer membrane and periplasmic space. Growth is fastidious; isolates require specialized media and conditions pioneered in diagnostic labs at Instituto de Salud Pública de Chile and modified by researchers at the Norwegian Veterinary Institute. Metabolic profiling has been compared with biochemical databases maintained by the Biological Magnetic Resonance Data Bank and culture collections such as the American Type Culture Collection.
Whole-genome sequencing projects carried out by consortia including groups from the Wellcome Sanger Institute and national sequencing centers have produced draft and closed genomes showing a circular chromosome and plasmid elements. Genomes encode secretion systems, iron-acquisition loci, and toxin-related genes homologous to systems studied in Vibrio, Salmonella, and Legionella species; comparative genomics has been deposited in databases at the European Nucleotide Archive and analyzed using pipelines from the Broad Institute. Studies of transcriptional responses during infection have referenced methods and standards from the National Institutes of Health and transcriptome resources like the Gene Expression Omnibus. Molecular tools for genetic manipulation remain limited, prompting reliance on proteomics platforms at the Proteomics Standards Initiative and experimental approaches adapted from laboratories at INRAE and the University of Washington.
P. salmonis primarily infects salmonids including Atlantic salmon, Coho salmon, and Chinook salmon in marine and freshwater farming systems managed by companies such as Marine Harvest and Cermaq. Environmental studies link prevalence to factors monitored by agencies like Fisheries and Oceans Canada and the Instituto de Fomento Pesquero (Chile), and to interactions with wild fish populations studied by conservation groups including WWF and universities such as University of Tasmania. Reservoirs, transmission via seawater, and potential vectors have been investigated in ecosystems examined by the Norwegian Institute for Water Research and the Institute of Marine Research (Norway), with concerns about spread through global trade routes governed by standards from the World Organisation for Animal Health.
Piscirickettsiosis manifests as systemic septicaemia with granulomatous lesions; clinical signs prompted regulatory action by bodies like the Food and Agriculture Organization and national veterinary services including the Scottish Government veterinary branch. Pathogenesis involves intracellular survival within fish macrophages, expression of putative virulence factors analogous to those characterized in Mycobacterium and Salmonella infections, and modulation of host immune responses studied using assays developed at the Roslin Institute and immunology groups at the Pasteur Institute. Outbreaks have had economic and policy impacts examined in reports by the Organisation for Economic Co-operation and Development and academic analyses from the University of Stirling.
Diagnostic workflows employ histopathology protocols standardized by laboratories such as the World Organisation for Animal Health reference centers, culture on cell lines established by institutes like the American Type Culture Collection, and molecular assays including PCR and qPCR methods validated in reference labs at the Norwegian Veterinary Institute and Fisheries and Oceans Canada. Serological tests, immunohistochemistry, and next-generation sequencing approaches from centers such as the Wellcome Sanger Institute complement traditional methods; accreditation and quality assurance follow guidelines from organizations including the International Organization for Standardization and the European Committee for Standardization.
Control strategies in aquaculture combine husbandry practices promoted by industry groups such as the Global Salmon Initiative and therapeutics regulated by national authorities like the Food and Drug Administration (United States) and the Servicio Agrícola y Ganadero (Chile). Antibiotic treatments historically used include compounds overseen by regulatory agencies; concerns about resistance have led to vaccine development efforts at institutions such as the University of Bergen, biotech firms in Norway and Chile, and trials coordinated with the World Organisation for Animal Health. Biosecurity measures, fallowing, selective breeding programs informed by genetics research at the Scottish Aquaculture Research Forum and the Institute of Aquaculture (University of Stirling), and integrated health management strategies are core to prevention.
Category:Fish bacterial diseases Category:Gammaproteobacteria