Infectious salmon anaemia virus (ISAV) in Chilean Atlantic salmon (Salmo salar) aquaculture: Emergence of low pathogenic ISAV-HPR0 and re-emergence of virulent ISAV-HPR: HPR3 and HPR14

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dc.contributor.authorGodoy, M.
dc.contributor.authorKibenge, M.
dc.contributor.authorSuarez, R.
dc.contributor.authorLazo, E.
dc.contributor.authorHeisinger, A.
dc.contributor.authorAguinaga, J.
dc.contributor.authorBravo, D.
dc.contributor.authorMendoza, J.
dc.contributor.authorLlegues, K.
dc.contributor.authorAvendaño-Herrera, R.
dc.contributor.authorVera, C.
dc.contributor.authorMardones, F.
dc.contributor.authorKibenge, F.
dc.date.accessioned2023-04-03T15:13:48Z
dc.date.available2023-04-03T15:13:48Z
dc.date.issued2013-11
dc.descriptionIndexación: Scopus.
dc.descriptionIndexación: Scopus.
dc.description.abstractInfectious salmon anaemia (ISA) is a serious disease of marine-farmed Atlantic salmon (Salmo salar) caused by ISA virus (ISAV), which belongs to the genus Isavirus, family Orthomyxoviridae. ISA is caused by virulent ISAV strains with deletions in a highly polymorphic region (HPR) of the hemagglutinin- esterase (HE) protein (designated virulent ISAV-HPR). This study shows the historic dynamics of ISAV-HPR and ISAV-HPR0 in Chile, the genetic relationship among ISAV-HPR0 reported worldwide and between ISAV-HPR0 and ISAV-HPR in Chile, and reports the 2013 ISA outbreak in Chile. The first ISA outbreak in Chile occurred from mid-June 2007 to 2010 and involved the virulent ISAV-HPR7b, which was then replaced by a low pathogenic ISAV-HPR0 variant. We analyzed this variant in 66 laboratory-confirmed ISAV-HPR0 cases in Chile in comparison to virulent ISAV-HPR that caused two new ISA outbreaks in April 2013. Multiple alignment and phylogenetic analysis of HE sequences from all ISAV-HPR0 viruses allowed us to identify three genomic clusters, which correlated with three residue patterns of ISAV-HPR0 (§ssup§360§esup§PST§ ssup§362§esup§, §ssup§360§esup§PAN§ ssup§362§esup§ and §ssup§360§esup§PAT§ ssup§362§esup§) in HPR. The virus responsible for the 2013 ISAV-HPR cases in Chile belonged to ISAV-HPR3 and ISAV-HPR14, and in phylogenetic analyses, both clustered with the ISAV-HPR0 found in Chile. The ISAV-HPR14 had the ISAV-HPR0 residue pattern §ssup§360§esup§ PAT§ssup§362§esup§, which is the only type of ISAV-HPR0 variant found in Chile. This suggested to us that the 2013 ISAV-HPR re-emerged from ISAV-HPR0 that is enzootic in Chilean salmon aquaculture and were not new introductions of virulent ISAV-HPR to Chile. The clinical presentations and diagnostic evidence of the 2013 ISA cases indicated a mixed infection of ISAV with the ectoparasite Caligus rogercresseyi and the bacterium Piscirickettsia salmonis, which underscores the need for active ISAV surveillance in areas where ISAV-HPR0 is enzootic, to ensure early detection and control of new ISA outbreaks, as it is considered a risk factor. This is the first report of ISA linked directly to the presence of ISAV-HPR0, and provides strong evidence supporting the contention that ISAV-HPR0 shows a strong relationship to virulent ISAV-HPR viruses and the possibility that it could mutate to virulent ISAV-HPR.es
dc.description.urihttps://virologyj.biomedcentral.com/articles/10.1186/1743-422X-10-344#rightslink
dc.identifier.citationVirology Journal, Volume 1023, November 2013, Article number 344es
dc.identifier.doi10.1186/1743-422X-10-344
dc.identifier.issn1743-422X
dc.identifier.urihttps://repositorio.unab.cl/xmlui/handle/ria/48119
dc.language.isoenes
dc.publisherBMCes
dc.rights.licenseAttribution 2.0 Generic (CC BY 2.0)
dc.rights.urihttps://virologyj.biomedcentral.com/about
dc.subjectPiscine Orthoreoviruses
dc.subjectTilapia Lake Viruses
dc.subjectFish Diseaseses
dc.subjectISAV-HPRes
dc.subjectISAV-HPR0es
dc.subjectLow pathogenic infectious salmon anaemia viruses
dc.subjectSalmo salares
dc.subjectVirulencees
dc.subjectVirulent ISAVes
dc.titleInfectious salmon anaemia virus (ISAV) in Chilean Atlantic salmon (Salmo salar) aquaculture: Emergence of low pathogenic ISAV-HPR0 and re-emergence of virulent ISAV-HPR: HPR3 and HPR14es
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