Volume 36, Number 4, July-August 2005
|Page(s)||615 - 628|
|How to cite this article||Vet. Res. (2005) 615-628|
Poultry, pig and the risk of BSE following the feed ban in France - A spatial analysisDavid Abriala, Didier Calavasb, Nathalie Jarrigeb and Christian Ducrota
a Unité d'Épidémiologie Animale, INRA Theix, 63122 Saint-Genès-Champanelle, France
b Unité Épidémiologie, AFSSA Lyon, 31 avenue T. Garnier, 69364 Lyon Cedex 07, France
(Received 24 September 2004; accepted 16 December 2004)
Abstract - A spatial analysis was carried out in order to analyse the reason why the risk of Bovine Spongiform Encephalopathy (BSE) was spatially heterogeneous in France, during the period following the feed ban of Meat and Bone Meal to cattle. The hypothesis of cross-contamination between cattle feedstuff and monogastric feedstuff, which was strongly suggested from previous investigations, was assessed, with the assumption that the higher the pig or poultry density is in a given area, the higher the risk of cross-contamination and cattle infection might be. The data concerned the 467 BSE cases born in France after the ban of meat and bone meal (July 1990) and detected between July 1st, 2001 and December 31, 2003, when the surveillance system was optimal and not spatially biased. The disease mapping models were elaborated with the Bayesian graphical modelling methods and based on a Poisson distribution with spatial smoothing (hierarchical approach) and covariates. The parameters were estimated by a Markov Chain Monte Carlo simulation method. The main result was that the poultry density did not significantly influence the risk of BSE whereas the pig density was significantly associated with an increase in the risk of 2.4% per 10 000 pigs. The areas with a significant pig effect were located in regions with a high pig density as well as a high ratio of pigs to cattle. Despite the absence of a global effect of poultry density on the BSE risk, some areas had a significant poultry effect and the risk was better explained in some others when considering both pig and poultry densities. These findings were in agreement with the hypothesis of cross-contamination, which could take place at the feedstuff factory, during the shipment of food or on the farm. Further studies are needed to more precisely explore how the cross-contamination happened.
Key words: BSE / bovine / poultry / pig / spatial analysis
Corresponding author: David Abrial email@example.com
© INRA, EDP Sciences 2005
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.