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Molecular epidemiology of betanodaviruses isolated from sea bass and sea bream cultured along the Tunisian coasts.
MedLine Citation:
PMID:  23288625     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Viral nervous necrosis (VNN) is a serious viral disease affecting farmed sea bass (Dicentrarchus labrax). Only scarce molecular data are available on the disease-causing betanodavirus populations in Tunisia. Therefore, we carried out the first molecular survey of betanodaviruses in farmed sea bass and sea bream (Sparus aurata) along the Tunisian coasts. Among 81 samples from five farms, 20 tested positive with RT-PCR, not only in clinical cases but also in asymptomatic fish before and during outbreaks. Positive fish were found in all farms, except in one farm investigated in the south of Tunisia. Sequencing the fragments of both genomic components (RNA1 and RNA2) in 16 isolates revealed that the Tunisian viruses were related to the red-spotted grouper nervous necrosis virus (RGNNV) genotype. Furthermore, the newly sequenced isolates were generally highly related to one another suggesting a recent common ancestor. They also showed high identities with other isolates obtained from wild fishes in the Mediterranean, but were slightly more divergent from strains recently obtained from farmed fishes in the Mediterranean. The poor genetic diversity of the viral population along the Tunisian coasts is striking. One hypothesis is that it is the result of the maintenance of a homogenous genetic pool among infected wild fish, groupers for instance and subsequent dissemination to farmed fish over the seasons.
Authors:
Sondès Haddad-Boubaker; Laurent Bigarré; Nadia Bouzgarou; Aida Megdich; Marine Baud; Joëlle Cabon; Noureddine Ben Chéhida
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-4
Journal Detail:
Title:  Virus genes     Volume:  -     ISSN:  1572-994X     ISO Abbreviation:  Virus Genes     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8803967     Medline TA:  Virus Genes     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Laboratoire de Virologie, Institut de la Recherche Vétérinaire de Tunisie, Université Tunis-El Manar, 20, rue Djebel Lakhdar-La Rabta, 1006, Tunis, Tunisia, sondes_hadded@yahoo.fr.
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