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Accueil du site → Doctorat → États-Unis → 2006 → The dynamics of rinderpest in Nomadic pastoral systems : The Somali surveillance example

Colorado State University (2006)

The dynamics of rinderpest in Nomadic pastoral systems : The Somali surveillance example

Tempia, Stefano

Titre : The dynamics of rinderpest in Nomadic pastoral systems : The Somali surveillance example

Auteur : Tempia, Stefano

Université de soutenance : Colorado State University

Grade : Doctor of Philosophy (PhD) 2006

It is currently believed that the only remaining foci of rinderpest (RP) circulation in the world are situated in the Somali eco-system which encompasses the Somali inhabited areas of Kenya and Ethiopia and the central and southern regions of Somalia. In order to delineate the extent of the remaining foci of RP in Somalia a cross-sectional sero-survey based on a two stage cluster sampling was designed. To obtain a representative sample in the absence of a sampling frame, the random selection of the primary sampling units was attained by the use of random map coordinates. The survey was conducted in ten administrative regions of central and southern Somalia. A total of 9,216 serum samples were collected from cattle aged 1 to 3 years in 562 sampling sites. The spatial dependency of the observed sero-prevalence was tested by the means of Moran’s I and local indicator of spatial autocorrelation, statistics. Both tests indicated a statistically significant spatial autocorrelation of the observations and two spatial sero-prevalence clusters were detected, suggesting the existence of two potential foci of RP maintenance in the country. Furthermore, the integration of conventional statistical techniques (i.e. logistic regression models) with spatial analysis and geographic information systems allowed the determination of the risk factors for RP maintenance and spreading as well as the estimation of the spatial risk of RP occurrence in the study area. The latter was used to develop a risk based approach for the zonation of the country according to the guidelines of the International Office of Epizootics. The study has demonstrated that the utilized methodology is able to produce reliable information from mobile livestock keeping systems. Furthermore, the study has generated important baseline data that will give a more focused direction towards the final eradication of RP in the Country. At present, the proposed methodology has been recommended by the African Union - Inter-African Bureau for Animal Resources to simultaneously investigate the status of RP in the three countries of the Somali eco-system in order to generate relevant information that will lead the final eradication of the disease from the Horn of Africa and the world

Mots clés : Virology, Rinderpest, Pastoral, Biological sciences, Animal diseases, Morbillivirus Somalia

Présentation (PROQUEST)

Page publiée le 15 février 2015, mise à jour le 10 septembre 2017