Landscape attributes driving avian influenza virus circulation in the Lake Alaotra region of Madagascar
| Autor: | René Rakotondravao, Marion Jourdan, Lucas Leger, Harentsoaniaina Rasamoelina Andriamanivo, Laure Guerrini, Véronique Chevalier, Sophie Molia, Mathilde Paul, Olivier Fridolin Maminiaina |
|---|---|
| Přispěvatelé: | Animal et gestion intégrée des risques (UPR AGIRs), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad), Interactions hôtes-agents pathogènes [Toulouse] (IHAP), Institut National de la Recherche Agronomique (INRA)-Ecole Nationale Vétérinaire de Toulouse (ENVT), Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National Polytechnique (Toulouse) (Toulouse INP), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées, Département de Recherches Zootechniques et Vétérinaires, Centre National de Recherche Appliquée au Développement Rural (FOFIFA), French Ministry of Foreign and European Affairs, Guerrini, Laure |
| Jazyk: | angličtina |
| Rok vydání: | 2014 |
| Předmět: |
Health (social science)
télédétection [SDV]Life Sciences [q-bio] Geography Planning and Development Medicine (miscellaneous) Wetland medicine.disease_cause L73 - Maladies des animaux Grassland Poultry 0403 veterinary science remote sensing 0302 clinical medicine Seroepidemiologic Studies Geese risk factors Savane analyse spatiale 2. Zero hunger geography.geographical_feature_category Ecology Health Policy 04 agricultural and veterinary sciences Facteur du milieu Poultry farming B10 - Géographie facteur de risque Ducks épidémiologie grippe aviaire epidemiology avian influenza epidemiology remote sensing spatial analysis risk factors landscape Madagascar Zone humide spatial analysis 040301 veterinary sciences Rizière Distribution géographique 030231 tropical medicine lcsh:G1-922 Land cover Environment avian influenza landscape Madagascar Sérologie 03 medical and health sciences medicine Seroprevalence Animals Couverture végétale Influenzavirus aviaire paysage geography Influenza A Virus H5N1 Subtype business.industry 15. Life on land Influenza A virus subtype H5N1 Lakes Enquête pathologique Influenza in Birds Paddy field Flock U30 - Méthodes de recherche business Landsat Chickens lcsh:Geography (General) |
| Zdroj: | Geospatial Health Geospatial Health, 2014, 8 (2), pp.445-453. ⟨10.4081/gh.2014.33⟩ Geospatial Health, Vol 8, Iss 2, Pp 445-453 (2014) Geospatial Health 2 (8), 445-453. (2014) |
| ISSN: | 1827-1987 |
| DOI: | 10.4081/gh.2014.33⟩ |
| Popis: | International audience; While the spatial pattern of the highly pathogenic avian influenza H5N1 virus has been studied throughout Southeast Asia, little is known on the spatial risk factors for avian influenza in Africa. In the present paper, we combined serological data from poultry and remotely sensed environmental factors in the Lake Alaotra region of Madagascar to explore for any association between avian influenza and landscape variables. Serological data from cross-sectional surveys carried out on poultry in 2008 and 2009 were examined together with a Landsat 7 satellite image analysed using supervised classification. The dominant landscape features in a 1-km buffer around farmhouses and distance to the closest water body were extracted. A total of 1,038 individual bird blood samples emanating from 241 flocks were analysed, and the association between avian influenza seroprevalence and these landcape variables was quantified using logistic regression models. No evidence of the presence of H5 or H7 avian influenza subtypes was found, suggesting that only low pathogenic avian influenza (LPAI) circulated. Three predominant land cover classes were identified around the poultry farms: grassland savannah, rice paddy fields and wetlands. A significant negative relationship was found between LPAI seroprevalence and distance to the closest body of water. We also found that LPAI seroprevalence was higher in farms characterised by predominant wetlands or rice landscapes than in those surrounded by dry savannah. Results from this study suggest that if highly pathogenic avian influenza H5N1 virus were introduced in Madagascar, the environmental conditions that prevail in Lake Alaotra region may allow the virus to spread and persist. |
| Databáze: | OpenAIRE |
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