Cristin-resultat-ID: 602792
Sist endret: 2. juni 2017 12:08
NVI-rapporteringsår: 2010
Vitenskapelig artikkel

Lack of evidence for vertical transmission of SAV 3 using gametes of Atlantic salmon, Salmo salar L., exposed by natural and experimental routes

  • Ruth Torill Kongtorp
  • Anne Stene
  • P.A. Andreassen
  • Vidar Aspehaug
  • D.A. Graham
  • Trude Marie Lyngstad
  • mfl.


Journal of Fish Diseases
ISSN 0140-7775
e-ISSN 1365-2761
NVI-nivå 2

Om resultatet

Vitenskapelig artikkel
Publiseringsår: 2010
Volum: 33
Hefte: 11
Sider: 879 - 888


Isi-ID: 000282689500002



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Lack of evidence for vertical transmission of SAV 3 using gametes of Atlantic salmon, Salmo salar L., exposed by natural and experimental routes


Pancreas disease (PD) is an important cause of losses in farmed salmonids in Norway, the United Kingdom and Ireland. As the spread of salmonid alphavirus (SAV), the causal agent, to naive populations is of major concern to the farming industry, it is important to uncover the transmission routes of the virus. This study was conducted to investigate the potential for vertical transmission of SAV subtype 3. Progeny of broodstock with signs of late-stage PD and persistent RT-PCR signals for SAV were followed from fertilization to smoltification in an experimental facility. Fertilized ova were either not disinfected or taken through one of three different disinfection regimes. Also, ova and milt from uninfected broodfish from a different population were exposed to a cell-cultured strain of SAV 3 immediately before fertilization to simulate a viraemic phase in parent fish. A group of uninfected controls were also included in the study. Fertilized ova from bath exposed and negative control groups were double disinfected. Following fertilization, experimental fish went through a normal freshwater phase. However, fry were stressed at first feeding to enhance replication of possibly latent virus. Smoltification was induced by an artificial light regime, and experimental fish were followed to the late smoltification phase. Selected samples were investigated by real-time RT-PCR for SAV, by histology for evidence of PD and by serology for neutralising antibodies against SAV. All analysed samples of progeny were negative. This result shows that SAV 3 is not readily transmitted vertically from parents to offspring. Additional negative PCR results from salmon sampled in commercial hatcheries support these findings. Also, recent studies have shown that risk factors for the horizontal transmission route explain the vast majority of PD outbreaks in Norway. It is concluded that if it happens at all, vertical transmission is of minor importance in the spread of SAV 3.


Ruth Torill Kongtorp

  • Tilknyttet:
    ved Epidemiologi ved Veterinærinstituttet

Anne Stene

  • Tilknyttet:
    ved Epidemiologi ved Veterinærinstituttet
  • Tilknyttet:
    ved Norges teknisk-naturvitenskapelige universitet

P.A. Andreassen

  • Tilknyttet:
    ved Rauma

Vidar Aspehaug

  • Tilknyttet:
    ved PatoGen Analyse AS

D.A. Graham

  • Tilknyttet:
    ved Storbritannia og Nord-Irland
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