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Selected Publication:

Type of publication: Journal Article
Type of document: Full Paper

Year: 2013

Authors: Troxler, S; Rigomier, P; Bilic, I; Liebhart, D; Prokofieva, I; Robineau, B; Hess, M

Title: Identification of a new reovirus causing substantial losses in broiler production in France, despite routine vaccination of breeders.

Source: Vet Rec. 2013; 172(21):556

Authors Vetmeduni Vienna:

Bilic Ivana
Hess Michael
Liebhart Dieter
Prokofieva Irina
Troxler Salome

Vetmed Research Units
University Clinic for Poultry and Fish Medicine, Clinical Unit of Poultry Medicine

Numerous cases of tenosynovitis appeared in France causing high morbidity in free-range and standard broilers. The main clinical findings were lameness, stunting and non-uniform bodyweights. Although the natural mortality was low, the economic losses due to birds that had to be removed from the flock prematurely, downgrading of carcases and lower average weights at slaughter were substantial. Postmortem examinations, bacteriological, virological and serological examination confirmed the aetiology of avian orthoreovirus (ARV)-induced tenosynovitis. The isolated ARVs were analysed serologically and genetically. Sequencing of σC RT-PCR products and phylogenetic analysis revealed a new type of ARV. The virus was not neutralised in serum neutralisation test using monovalent sera from vaccinated chickens. Together with the flock data, epidemiology of these recent reovirus outbreaks in France was reconstructed. It is concluded that these reovirus isolates differ serologically and genetically from the well described reovirus isolates used in commercial vaccines which were not capable of preventing the disease. The outbreaks resulted in substantial losses in broilers from vaccinated breeders.

Keywords Pubmed: Animal Husbandry/economics
Animal Husbandry/methods
Disease Outbreaks/economics
Disease Outbreaks/prevention & control
Disease Outbreaks/veterinary*
Orthoreovirus, Avian/genetics
Orthoreovirus, Avian/isolation & purification*
Poultry Diseases/economics*
Poultry Diseases/epidemiology*
Poultry Diseases/prevention & control
Reoviridae Infections/economics*
Reoviridae Infections/epidemiology*
Reoviridae Infections/prevention & control
Tenosynovitis/prevention & control
Vaccination/statistics & numerical data

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