Agro-environmental determinants of avian influenza circulation: A multisite study in Thailand, Vietnam and Madagascar

Paul Mathilde, Gilbert Marius, Desvaux Stéphanie, Rasamoelina-Andriamanivo Harena, Peyre Marie-Isabelle, Khong Nguyen Viet, Thanapongtharm Weerapong, Chevalier Véronique. 2014. Agro-environmental determinants of avian influenza circulation: A multisite study in Thailand, Vietnam and Madagascar. PloS One, 9 (7):e101958, 10 p.

Journal article ; Article de revue à facteur d'impact Revue en libre accès total
Published version - Anglais
Use under authorization by the author or CIRAD.

Télécharger (853kB) | Preview


Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie; Staps

Abstract : Outbreaks of highly pathogenic avian influenza have occurred and have been studied in a variety of ecological systems. However, differences in the spatial resolution, geographical extent, units of analysis and risk factors examined in these studies prevent their quantitative comparison. This study aimed to develop a high-resolution, comparative study of a common set of agro-environmental determinants of avian influenza viruses (AIV) in domestic poultry in four different environments: (1) lower-Northern Thailand, where H5N1 circulated in 2004-2005, (2) the Red River Delta in Vietnam, where H5N1 is circulating widely, (3) the Vietnam highlands, where sporadic H5N1 outbreaks have occurred, and (4) the Lake Alaotra region in Madagascar, which features remarkable similarities with Asian agro-ecosystems and where low pathogenic avian influenza viruses have been found. We analyzed H5N1 outbreak data in Thailand in parallel with serological data collected on the H5 subtype in Vietnam and on low pathogenic AIV in Madagascar. Several agro-environmental covariates were examined: poultry densities, landscape dominated by rice cultivation, proximity to a water body or major road, and human population density. Relationships between covariates and AIV circulation were explored using spatial generalized linear models. We found that AIV prevalence was negatively associated with distance to the closest water body in the Red River Delta, Vietnam highlands and Madagascar. We also found a positive association between AIV and duck density in the Vietnam highlands and Thailand, and with rice landscapes in Thailand and Madagascar. Our findings confirm the important role of wetlands-rice-ducks ecosystems in the epidemiology of AI in diverse settings. Variables influencing circulation of the H5 subtype in Southeast Asia played a similar role for low pathogenic AIV in Madagascar, indicating that this area may be at risk if a highly virulent strain is introduced. (Résumé d'auteur)

Mots-clés Agrovoc : Influenzavirus aviaire, Épidémiologie, Transmission des maladies, Facteur du milieu, Facteur de risque, Étude de cas, Volaille, Canard, Densité de population, Paysage agricole, Rizière, Zone humide

Mots-clés géographiques Agrovoc : Madagascar, Viet Nam, Thaïlande

Mots-clés géographiques complémentaires : Lac Alaotra

Classification Agris : L73 - Animal diseases

Champ stratégique Cirad : Axe 4 (2014-2018) - Santé des animaux et des plantes

Auteurs et affiliations

  • Paul Mathilde, ENVT (FRA)
  • Gilbert Marius, ULB (BEL)
  • Desvaux Stéphanie, CIRAD-ES-UPR AGIRs (FRA)
  • Rasamoelina-Andriamanivo Harena, CENDRADERU (MDG)
  • Peyre Marie-Isabelle, CIRAD-ES-UPR AGIRs (VNM) ORCID: 0000-0002-0887-3418
  • Khong Nguyen Viet, National Institute of Veterinary Research (VNM)
  • Thanapongtharm Weerapong, Department of Livestock Development (THA)
  • Chevalier Véronique, CIRAD-ES-UPR AGIRs (FRA)

Source : Cirad - Agritrop (

View Item (staff only) View Item (staff only)

[ Page générée et mise en cache le 2021-02-28 ]