Document Detail


Salmonid alphavirus (SAV) and pancreas disease (PD) in Atlantic salmon, Salmo salar L., in freshwater and seawater sites in Norway from 2006 to 2008.
MedLine Citation:
PMID:  20158578     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A cohort study was initiated in the spring of 2006 to investigate epidemiological aspects and pathogenesis of salmonid alphavirus (SAV) subtype 3 infections and pancreas disease (PD). The aims were to assess involvement of the freshwater production phase, the extent and frequency of subclinical infections and to follow PD-affected populations throughout the entire seawater production cycle, as well as investigate possible risk factors for PD outbreaks. Fish groups from 46 different Atlantic salmon freshwater sites in six counties were sampled once prior to seawater transfer and followed onto their seawater sites. A total of 51 Atlantic salmon seawater sites were included, and fish groups were sampled three times during the seawater production phase. SAV subtype 3 was not identified by real-time RT-PCR from samples collected in the freshwater phase, nor were any SAV-neutralizing antibodies or histopathological changes consistent with PD. In the seawater phase, SAV was detected in samples from 23 of 36 (63.9%) studied sites located within the endemic region. No SAV subtype 3 was detected in samples from seawater sites located outside the endemic region. The cumulative incidence of PD during the production cycle amongst sites with SAV detected was 87% (20 of 23 sites). Average fish weight at time of PD diagnosis ranged from 461 to 5978 g, because of a wide variation in the timing of disease occurrence throughout the production cycle. Mortality levels following a PD diagnosis varied greatly between populations. The mean percentage mortality was 6.9% (+/-7.06) (range 0.7-26.9), while the mean duration of increased mortality following PD diagnosis was 2.8 months (+/-1.11) (range 1-6).
Authors:
M D Jansen; T Taksdal; M A Wasmuth; B Gjerset; E Brun; A B Olsen; O Breck; M Sandberg
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-02-10
Journal Detail:
Title:  Journal of fish diseases     Volume:  33     ISSN:  1365-2761     ISO Abbreviation:  J. Fish Dis.     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-05-03     Completed Date:  2010-08-19     Revised Date:  2010-08-25    
Medline Journal Info:
Nlm Unique ID:  9881188     Medline TA:  J Fish Dis     Country:  England    
Other Details:
Languages:  eng     Pagination:  391-402     Citation Subset:  IM    
Affiliation:
Norwegian School of Veterinary Science, Centre for Epidemiology and Biostatistics, Oslo, Norway. Mona.Dverdal.Jansen@nvh.no
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MeSH Terms
Descriptor/Qualifier:
Alphavirus
Alphavirus Infections / epidemiology,  mortality,  pathology,  veterinary*
Animals
Antibodies, Viral / blood
Cohort Studies
Fish Diseases / epidemiology*,  mortality,  pathology*,  virology
Fresh Water*
Incidence
Kaplan-Meiers Estimate
Norway
Pancreatic Diseases / epidemiology,  mortality,  pathology,  veterinary*,  virology
Polymerase Chain Reaction
Prevalence
Risk Factors
Salmo salar
Seawater*
Chemical
Reg. No./Substance:
0/Antibodies, Viral
Comments/Corrections
Erratum In:
J Fish Dis. 2010 Aug;33(8):705

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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