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Nielsen SS, Alvarez J, Bicout D, Calistri P, Canali E, Drewe JA, Garin‐Bastuji B, Gonzales Rojas JL, Smith CG, Herskin M, Michel V, Miranda Chueca MA, Padalino B, Spoolder H, Ståhl K, Velarde A, Viltrop A, Winckler C, Arzul I, Dharmaveer S, Olesen NJ, Schiøtt M, Sindre H, Stone D, Vendramin N, Aires M, Asensio IA, Antoniou S, Barizzone F, Dhollander S, Gnocchi M, Karagianni AE, Kero LL, Munoz Guajardo IP, Rusina A, Roberts H. Species which may act as vectors or reservoirs of diseases covered by the Animal Health Law: Listed pathogens of fish. EFSA J 2023; 21:e08174. [PMID: 37533750 PMCID: PMC10392593 DOI: 10.2903/j.efsa.2023.8174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023] Open
Abstract
Vector or reservoir species of five fish diseases listed in the Animal Health Law were identified, based on evidence generated through an extensive literature review (ELR), to support a possible updating of Regulation (EU) 2018/1882. Fish species on or in which highly polymorphic region-deleted infectious salmon anaemia virus (HPR∆ ISAV), Koi herpes virus (KHV), epizootic haematopoietic necrosis virus (EHNV), infectious haematopoietic necrosis virus (IHNV) or viral haemorrhagic septicaemia virus (VHSV) were detected, in the field or during experiments, were classified as reservoir species with different levels of certainty depending on the diagnostic tests used. Where experimental evidence indicated transmission of the pathogen from a studied species to another known susceptible species, the studied species was classified as a vector species. Although the quantification of the risk of spread of the pathogens by the vectors or reservoir species was not part of the terms or reference, such risks do exist for the vector species, since transmission from infected vector species to susceptible species was proven. Where evidence for transmission from infected fish was not found, these were defined as reservoirs. Nonetheless, the risk of the spread of the pathogens from infected reservoir species cannot be excluded. Evidence identifying conditions that may prevent transmission by vectors or reservoir fish species during transport was collected from scientific literature. For VHSV, IHNV or HPR∆ ISAV, it was concluded that under transport conditions at temperatures below 25°C, it is likely (66-90%) they will remain infective. Therefore, vector or reservoir species that may have been exposed to these pathogens in an affected area in the wild, aquaculture establishments or through water supply can possibly transmit VHSV, IHNV or HPR∆ ISAV into a non-affected area when transported at a temperature below 25°C. The conclusion was the same for EHN and KHV; however, they are likely to remain infective under all transport temperatures.
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Furey NB, Bass AL, Miller KM, Li S, Lotto AG, Healy SJ, Drenner SM, Hinch SG. Infected juvenile salmon can experience increased predation during freshwater migration. R Soc Open Sci 2021; 8:201522. [PMID: 33959321 PMCID: PMC8074935 DOI: 10.1098/rsos.201522] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 03/03/2021] [Indexed: 05/07/2023]
Abstract
Predation risk for animal migrants can be impacted by physical condition. Although size- or condition-based selection is often observed, observing infection-based predation is rare due to the difficulties in assessing infectious agents in predated samples. We examined predation of outmigrating sockeye salmon (Oncorhynchus nerka) smolts by bull trout (Salvelinus confluentus) in south-central British Columbia, Canada. We used a high-throughput quantitative polymerase chain reaction (qPCR) platform to screen for the presence of 17 infectious agents found in salmon and assess 14 host genes associated with viral responses. In one (2014) of the two years assessed (2014 and 2015), the presence of infectious haematopoietic necrosis virus (IHNv) resulted in 15-26 times greater chance of predation; in 2015 IHNv was absent among all samples, predated or not. Thus, we provide further evidence that infection can impact predation risk in migrants. Some smolts with high IHNv loads also exhibited gene expression profiles consistent with a virus-induced disease state. Nine other infectious agents were observed between the two years, none of which were associated with increased selection by bull trout. In 2014, richness of infectious agents was also associated with greater predation risk. This is a rare demonstration of predator consumption resulting in selection for prey that carry infectious agents. The mechanism by which this selection occurs is not yet determined. By culling infectious agents from migrant populations, fish predators could provide an ecological benefit to prey.
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Affiliation(s)
- Nathan B. Furey
- Department of Biological Sciences, University of New Hampshire, Durham, NH, USA
| | - Arthur L. Bass
- Pacific Salmon Ecology and Conservation Laboratory, Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, Canada
| | - Kristi M. Miller
- Fisheries and Oceans Canada, Molecular Genetics Section, Pacific Biological Station, Nanaimo, Canada
| | - Shaorong Li
- Fisheries and Oceans Canada, Molecular Genetics Section, Pacific Biological Station, Nanaimo, Canada
| | - Andrew G. Lotto
- Pacific Salmon Ecology and Conservation Laboratory, Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, Canada
| | - Stephen J. Healy
- Fisheries and Oceans Canada, Science Branch, Pacific Region, 4160 Marine Dr., West Vancouver, British Columbia, Canada
| | - S. Matthew Drenner
- Stillwater Sciences, 555 W. Fifth St, 35th floor, Los Angeles, CA, USA
- Marine Science Institute, University of California Santa Barbara, Santa Barbara, CA, USA
| | - Scott G. Hinch
- Pacific Salmon Ecology and Conservation Laboratory, Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, Canada
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Mulei IR, Nyaga PN, Mbuthia PG, Waruiru RM, Xu C, Evensen Ø, Mutoloki S. First detection and isolation of infectious haematopoietic necrosis virus from farmed rainbow trout in Nyeri County, Kenya. J Fish Dis 2019; 42:751-758. [PMID: 30805926 DOI: 10.1111/jfd.12979] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 01/21/2019] [Accepted: 01/22/2019] [Indexed: 06/09/2023]
Abstract
Infectious haematopoietic necrosis virus (IHNV) is the causative agent of infectious haematopoietic necrosis, a disease of salmonid responsible for great economic losses. The disease occurs in most parts of the world where rainbow trout is reared but has not been previously reported in Kenya. In this study, rainbow trout fry and growers from two farms in Nyeri County were screened for IHNV. Whole fry (n = 4 from each farm) and kidney samples from growers (n = 15 and n = 6 from the two farms, respectively) were collected and preserved for cell culture examination or PCR analysis. Screening of samples was done by PCR followed by sequencing of the glycoprotein gene of the virus. Demonstration of the virus was done by propagation in EPC cells followed by the indirect fluorescence antibody test (IFAT). The results revealed the presence of IHNV at low prevalence of 0.1 and 0.4 for the two farms. The virus was confirmed both by IFAT and by partial sequencing of the G gene. Phylogenetic analysis revealed that the Kenyan isolates were identical to those of the J genogroup found mostly in Asia. The findings have implications for biosecurity measures and import regulations for the Kenyan rainbow trout industry.
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Affiliation(s)
- Isaac R Mulei
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
- Department of Veterinary Pathology, Microbiology & Parasitology, University of Nairobi, Faculty of Veterinary Medicine, Nairobi, Kenya
| | - Phillip N Nyaga
- Department of Veterinary Pathology, Microbiology & Parasitology, University of Nairobi, Faculty of Veterinary Medicine, Nairobi, Kenya
| | - Paul G Mbuthia
- Department of Veterinary Pathology, Microbiology & Parasitology, University of Nairobi, Faculty of Veterinary Medicine, Nairobi, Kenya
| | - Robert M Waruiru
- Department of Veterinary Pathology, Microbiology & Parasitology, University of Nairobi, Faculty of Veterinary Medicine, Nairobi, Kenya
| | - Cheng Xu
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Øystein Evensen
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
| | - Stephen Mutoloki
- Faculty of Veterinary Medicine, Norwegian University of Life Sciences, Oslo, Norway
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Hoferer M, Akimkin V, Skrypski J, Schütze H, Sting R. Improvement of a diagnostic procedure in surveillance of the listed fish diseases IHN and VHS. J Fish Dis 2019; 42:559-572. [PMID: 30779211 DOI: 10.1111/jfd.12968] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 12/19/2018] [Accepted: 12/20/2018] [Indexed: 06/09/2023]
Abstract
Infectious haematopoietic necrosis (IHN) and viral haemorrhagic septicaemia (VHS) are OIE-listed and notifiable viral fish diseases which are controlled by eradication and surveillance programmes globally. The present study provides improved RT-qPCR procedures based on recently described OIE protocols. Improvements comprise the design of a new TaqMan® probe, replacing a TaqMan® MGB probe that turned out to show impaired binding. Reason for this is SNPs detected in the nucleoprotein N gene sequences of IHNV strains targeted by the RT-qPCR. Furthermore, the IHNV and VHSV RT-qPCR assays were realized as one-step and one-run procedures supplemented by an endogenous control system. The IHNV and VHSV RT-qPCR assays are characterized by a technical sensitivity of 19 and 190 gene equivalents (cRNA) and an analytical sensitivity of 2-7 and 13 TCID50 /ml, respectively. For verification purposes, 105 IHNV and 165 VHSV isolates and several non-targeted viral and bacterial pathogens were included and returned adequate results. However, in field samples divergent results left 14 samples of 154 undetected for IHNV and one sample of 127 for VHSV using cell culture. The study shows that RT-qPCR assays ensure facilitated and reliable testing on IHNV and VHSV in eradication and surveillance programmes.
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Affiliation(s)
- Marc Hoferer
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
| | - Valerij Akimkin
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
| | - Julia Skrypski
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
| | - Heike Schütze
- Federal Research Institute for Animal Health, Institute of Infectology, Friedrich Loeffler Institute, Greifswald-Insel Riems, Germany
| | - Reinhard Sting
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
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Emmenegger EJ, Biacchesi S, Mérour E, Glenn JA, Palmer AD, Brémont M, Kurath G. Virulence of a chimeric recombinant infectious haematopoietic necrosis virus expressing the spring viraemia of carp virus glycoprotein in salmonid and cyprinid fish. J Fish Dis 2018; 41:67-78. [PMID: 28799647 DOI: 10.1111/jfd.12678] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 05/25/2017] [Accepted: 05/27/2017] [Indexed: 06/07/2023]
Abstract
Infectious haematopoietic necrosis virus (IHNV) and spring viraemia of carp virus (SVCV) are both rhabdoviruses of fish, listed as notifiable disease agents by the World Organization for Animal Health. Recombinant rhabdoviruses with heterologous gene substitutions have been engineered to study genetic determinants and assess the potential of these recombinant viruses for vaccine development. A recombinant IHNV (rIHNV), containing the full-length genome of a European IHNV strain, was modified by deleting the glycoprotein (G) gene and replacing it with a European SVCV G-gene to make the rIHNV-Gsvcv. The chimeric rIHNV-Gsvcv level of virulence in rainbow trout, common carp and koi was assessed, and its ability to induce a protective immune response in surviving koi against wild-type SVCV infection was tested. The rIHNV-Gsvcv infection of trout led to high mortality, ranging from 78% to 92.5%, after immersion. In contrast, no deaths occurred in juvenile common carp after infection with rIHNV-Gsvcv by either immersion or intraperitoneal (IP) injection. Similarly, koi infected with rIHNV-Gsvcv via IP injection had little to no mortality (≤9%). Koi that survived initial infection with a high dose of recombinant virus rIHNV-Gsvcv were protected against a virulent SVCV challenge resulting in a high relative per cent survival of 82.5%.
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Affiliation(s)
- E J Emmenegger
- US Geological Survey, Western Fisheries Research Center, Seattle, WA, USA
| | - S Biacchesi
- Virologie et Immunologie Moléculaires (VIM), INRA, Université Paris-Saclay, Jouy-en-Josas, France
| | - E Mérour
- Virologie et Immunologie Moléculaires (VIM), INRA, Université Paris-Saclay, Jouy-en-Josas, France
| | - J A Glenn
- NanoString Technologies Inc., Seattle, WA, USA
| | - A D Palmer
- Department of Microbiology, Chemical and Life Sciences Laboratories, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - M Brémont
- Virologie et Immunologie Moléculaires (VIM), INRA, Université Paris-Saclay, Jouy-en-Josas, France
| | - G Kurath
- US Geological Survey, Western Fisheries Research Center, Seattle, WA, USA
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Rodriguez Saint-Jean S, González C, Monrás M, Romero A, Ballesteros N, Enríquez R, Perez-Prieto S. Establishment and characterization of a new cell line (SSP-9) derived from Atlantic salmon Salmo salar that expresses type I ifn. J Fish Biol 2014; 85:1526-1545. [PMID: 25230295 DOI: 10.1111/jfb.12503] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Accepted: 07/11/2014] [Indexed: 06/03/2023]
Abstract
In the present work, the establishment and biological characterization of a new cell line, SSP-9, derived from the pronephros of the Atlantic salmon Salmo salar, are reported. These cells grew well in Leibovitz's (L15) medium supplemented with 10% foetal calf serum at temperatures from 15 to 25° C, and they have been sub-cultured over 100 passages to produce a continuous cell line with an epithelial-like morphology. The SSP-9 cells attached and spread efficiently at different plating densities, retaining 80% of cell viability after storage in liquid nitrogen. When karyotyped, the cells had 40-52 chromosomes, with a modal number of 48. Viral susceptibility tests showed that SSP-9 cells were susceptible to infectious pancreatic necrosis virus and infectious haematopoietic necrosis virus, producing infectious virus and regular cytopathic effects. Moreover, these cells could be stimulated by poly I:C, showing significant up-regulation in the expression of the genes that regulate immune responses, such as ifn and mx-1. SSP-9 cells constitutively express genes characteristic of macrophages, such as major histocompatibility complex (mhc-II) and interleukin 12b (il-12b), and flow cytometry assays confirmed that SSP-9 cells can be permanently transfected with plasmids expressing a reporter gene. Accordingly, this new cell line is apparently suitable for transgenic manipulation, and to study host cell-virus interactions and immune processes.
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Alonso M, Stein DA, Thomann E, Moulton HM, Leong JC, Iversen P, Mourich DV. Inhibition of infectious haematopoietic necrosis virus in cell cultures with peptide-conjugated morpholino oligomers. J Fish Dis 2005; 28:399-410. [PMID: 16083445 PMCID: PMC7197465 DOI: 10.1111/j.1365-2761.2005.00641.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Delivery of phosphorodiamidate morpholino oligomers (PMO) into fish cells in vitro and tissues in vivo was examined. Uptake was evaluated by fluorescence microscopy and flow cytometry after treating cultured cells or live rainbow trout with 3' fluorescein-tagged PMO. Arginine-rich peptide conjugated to the 5' end of the PMO markedly enhanced cellular uptake in culture by 8- to 20-fold compared with non-peptide-conjugated PMO as determined by flow cytometry. Enhanced uptake of PMO conjugated to peptide was also observed in tissues of fish treated by immersion. The efficacy of PMO as inhibitors of infectious haematopoietic necrosis virus (IHNV) replication was determined in vitro. Peptide-conjugated PMOs targeting sequences within the IHNV genomic RNA (negative polarity) or antigenomic RNA (positive polarity) significantly inhibited replication in a dose-dependent and sequence-specific manner. A PMO complementary to sequence near the 5' end of IHNV genomic RNA was the most effective, diminishing titre by 97%, as measured by plaque assay and Western blot. These data demonstrate that replication of a negative-stranded non-segmented RNA virus can be inhibited by antisense compounds that target positive polarity viral RNA, or by a compound that targets negative polarity viral RNA.
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Affiliation(s)
- M Alonso
- Department of Microbiology and Center for Fish Disease Research, Oregon State University, Corvallis, OR, USA.
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