Identification de virus de la fièvre catarrhale ovine réassortis dans la région Ouest méditerranéenne

Auteurs

    N.S. Maan, S. Maan, k. Nomikou, P.P.C. Mertens

DOI :

https://doi.org/10.19182/remvt.10072

Mots-clés


Virus de la fièvre catarrhale ovine, Bluetongue, Sérotype, Europe

Résumé

Bluetongue virus (BTV) is the species of the genus Orbivirus of the family Reoviridae. BTV can infect most ruminants, caus­ing a severe haemorrhagic disease called bluetongue in sheep. BTV is transmitted among ruminant hosts by certain species of Culicoides (biting midges). The BTV genome is composed of ten linear double-stranded (ds) RNA genome segments, encod­ing seven structural and three non-structural proteins. The seg­mented nature of the genome allows different BTV strains infect­ing the same cell to exchange (reassort) genome segments.  Nine BTV serotypes have been detected in Europe since 1998, including strains belonging to both eastern (BTV-1, 9, 16) and western lineages (BTV-1, 2, 4, 6, 8, 11). Live attenuated mono­valent vaccine strains of BTV-2, 4, 8, 9 (western group) and BTV- 16 (eastern group) have also been used in the Mediterranean region, in attempts to minimise virus circulation. The release of these vaccine strains, some of which have persisted in the field (including BTV-2 and 16), has added further genetic diversity, generating an unprecedented mix of field and vaccine strain viruses. These events have provided unique opportunities for genome segment exchange (reassortment) between different BTV strains and topotypes. Indeed, a strain of BTV-2, derived by reassortment between vaccine strains of BTV-2 and 16 has been previously detected in Italy during 2002.  Full genome sequence analysis of BTV-2 and BTV-4 isolates (1999-2004) from the Western Mediterranean region helped to identify multiple reassortant viruses, involving the exchange of several different genome segments. Reassortant viruses were identified as containing genes derived from different western field strains, from western field and vaccine strains, and from eastern field and western vaccine strains. The detection of these reassortant BTVs in Europe highlights concerns about the use of live BTV vaccines in the region.

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Affiliations

  • N.S. Maan Arbovirus Molecular Research Group, Department of Vector-Borne Diseases, Institute for Animal Health, Pirbright Laboratory, Woking, Surrey, GU24 0NF, United Kingdom.
  • S. Maan Arbovirus Molecular Research Group, Department of Vector-Borne Diseases, Institute for Animal Health, Pirbright Laboratory, Woking, Surrey, GU24 0NF, United Kingdom.
  • k. Nomikou Arbovirus Molecular Research Group, Department of Vector-Borne Diseases, Institute for Animal Health, Pirbright Laboratory, Woking, Surrey, GU24 0NF, United Kingdom.
  • P.P.C. Mertens Arbovirus Molecular Research Group, Department of Vector-Borne Diseases, Institute for Animal Health, Pirbright Laboratory, Woking, Surrey, GU24 0NF, United Kingdom.

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Reçu

18-12-2014

Publié

01-02-2009

Comment citer

Maan, N. S., Maan, S., Nomikou, k., & Mertens, P. P. (2009). Identification de virus de la fièvre catarrhale ovine réassortis dans la région Ouest méditerranéenne. Revue d’élevage Et De médecine vétérinaire Des Pays Tropicaux, 62(2-4), 167–167. https://doi.org/10.19182/remvt.10072

Numéro

Rubrique

Santé animale et épidémiologie

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