Comparison of the dynamics of Japanese encephalitis virus circulation in sentinel pigs between a rural and a peri-urban setting in Cambodia

Di Francesco Juliette, Choeung Rithy, Peng Borin, Pring Long, Pang Senglong, Duboz Raphaël, Ong Sivuth, Sorn San, Tarantola Arnaud, Fontenille Didier, Duong Veasna, Dussart Philippe, Chevalier Véronique, Cappelle Julien. 2018. Comparison of the dynamics of Japanese encephalitis virus circulation in sentinel pigs between a rural and a peri-urban setting in Cambodia. PLoS Neglected Tropical Diseases, 12 (8):e0006644, 18 p.

Url - jeu de données - Entrepôt autre : https://figshare.com/articles/Comparison_of_the_dynamics_of_Japanese_encephalitis_virus_circulation_in_sentinel_pigs_between_a_rural_and_a_peri-urban_setting_in_Cambodia/7001855

Résumé : Japanese encephalitis is mainly considered a rural disease, but there is growing evidence of a peri-urban and urban transmission in several countries, including Cambodia. We, therefore, compared the epidemiologic dynamic of Japanese encephalitis between a rural and a peri-urban setting in Cambodia. We monitored two cohorts of 15 pigs and determined the force of infection–rate at which seronegative pigs become positive–in two study farms located in a peri-urban and rural area, respectively. We also studied the mosquito abundance and diversity in proximity of the pigs, as well as the host densities in both areas. All the pigs seroconverted before the age of 6 months. The force of infection was 0.061 per day (95% confidence interval = 0.034–0.098) in the peri-urban cohort and 0.069 per day (95% confidence interval = 0.047–0.099) in the rural cohort. Several differences in the epidemiologic dynamic of Japanese encephalitis between both study sites were highlighted. The later virus amplification in the rural cohort may be linked to the later waning of maternal antibodies, but also to the higher pig density in direct proximity of the studied pigs, which could have led to a dilution of mosquito bites at the farm level. The force of infection was almost identical in both the peri-urban and the rural farms studied, which shifts the classic epidemiologic cycle of the virus. This study is a first step in improving our understanding of Japanese encephalitis virus ecology in different environments with distinct landscapes, human and animal densities.

Mots-clés géographiques Agrovoc : Cambodge

Classification Agris : L73 - Maladies des animaux
S50 - Santé humaine

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

Auteurs et affiliations

• Di Francesco Juliette, Institut Pasteur du Cambodge (KHM) - auteur correspondant
• Choeung Rithy, Institut Pasteur du Cambodge (KHM)
• Peng Borin, Institut Pasteur du Cambodge (KHM)
• Pring Long, Royal University of Agriculture (KHM)
• Pang Senglong, Institut Pasteur du Cambodge (KHM)
• Duboz Raphaël, CIRAD-BIOS-UMR ASTRE (KHM) ORCID: 0000-0002-2853-6195
• Ong Sivuth, Institut Pasteur du Cambodge (KHM)
• Sorn San, NAVRI (KHM)
• Tarantola Arnaud, Institut Pasteur du Cambodge (KHM)
• Fontenille Didier, Institut Pasteur du Cambodge (KHM)
• Duong Veasna, Institut Pasteur du Cambodge (KHM)
• Dussart Philippe, Institut Pasteur du Cambodge (KHM)
• Chevalier Véronique, CIRAD-BIOS-UMR ASTRE (KHM)
• Cappelle Julien, CIRAD-BIOS-UMR ASTRE (FRA) ORCID: 0000-0001-7668-1971

Source : Cirad-Agritrop (https://agritrop.cirad.fr/588740/)

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