Int J Health Geogr - Characterizing the interface between wild ducks and poultry to evaluate the potential of transmission of avian pathogens.

Tópicos

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Resumo

CKGROUND: Characterizing the interface between wild and domestic animal populations is increasingly recognized as essential in the context of emerging infectious diseases (EIDs) that are transmitted by wildlife. More specifically, the spatial and temporal distribution of contact rates between wild and domestic hosts is a key parameter for modeling EIDs transmission dynamics. We integrated satellite telemetry, remote sensing and ground-based surveys to evaluate the spatio-temporal dynamics of indirect contacts between wild and domestic birds to estimate the risk that avian pathogens such as avian influenza and Newcastle viruses will be transmitted between wildlife to poultry. We monitored comb ducks (Sarkidiornis melanotos melanotos) with satellite transmitters for seven months in an extensive Afro-tropical wetland (the Inner Niger Delta) in Mali and characterise the spatial distribution of backyard poultry in villages. We modelled the spatial distribution of wild ducks using 250-meter spatial resolution and 8-days temporal resolution remotely-sensed environmental indicators based on a Maxent niche modelling method.RESULTS: Our results show a strong seasonal variation in potential contact rate between wild ducks and poultry. We found that the exposure of poultry to wild birds was greatest at the end of the dry season and the beginning of the rainy season, when comb ducks disperse from natural water bodies to irrigated areas near villages.CONCLUSIONS: Our study provides at a local scale a quantitative evidence of the seasonal variability of contact rate between wild and domestic bird populations. It illustrates a GIS-based methodology for estimating epidemiological contact rates at the wildlife and livestock interface integrating high-resolution satellite telemetry and remote sensing data.

Resumo Limpo

ckground character interfac wild domest anim popul increas recogn essenti context emerg infecti diseas eid transmit wildlif specif spatial tempor distribut contact rate wild domest host key paramet model eid transmiss dynam integr satellit telemetri remot sens groundbas survey evalu spatiotempor dynam indirect contact wild domest bird estim risk avian pathogen avian influenza newcastl virus will transmit wildlif poultri monitor comb duck sarkidiorni melanoto melanoto satellit transmitt seven month extens afrotrop wetland inner niger delta mali characteris spatial distribut backyard poultri villag model spatial distribut wild duck use meter spatial resolut day tempor resolut remotelysens environment indic base maxent nich model methodresult result show strong season variat potenti contact rate wild duck poultri found exposur poultri wild bird greatest end dri season begin raini season comb duck dispers natur water bodi irrig area near villagesconclus studi provid local scale quantit evid season variabl contact rate wild domest bird popul illustr gisbas methodolog estim epidemiolog contact rate wildlif livestock interfac integr highresolut satellit telemetri remot sens data

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