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| Registros recuperados: 26 | |
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| Cumming, Graeme S.; Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, 7701, South Africa; graeme.cumming@uct.ac.za; Hockey, Philip A. R.; Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, 7701, South Africa; phil.hockey@uct.ac.za; Bruinzeel, Leo W.; Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, 7701, South Africa; lbruinze@adu.uct.ac.za; Du Plessis, Morne A.; Percy FitzPatrick Institute, DST/NRF Center of Excellence, University of Cape Town, Rondebosch, 7701, South Africa; mornedup@vodamail.co.za. |
| Global analyses of the potential for avian influenza transmission by wild birds have ignored key characteristics of the southern African avifauna. Although southern Africa hosts a variety of migratory, Holarctic-breeding wading birds and shorebirds, the documented prevalence of avian influenza in these species is low. The primary natural carriers of influenza viruses in the northern hemisphere are the anatids, i.e., ducks. In contrast to Palearctic-breeding species, most southern African anatids do not undertake predictable annual migrations and do not follow migratory flyways. Here we present a simple, spatially explicit risk analysis for avian influenza transmission by wild ducks in southern Africa. We developed a risk value for each of 16 southern... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Anatidae; Avian influenza; Botswana; Ducks; Influenza; Landscape ecology; Namibia; Pathogen; South Africa; Virus; Waterfowl; Zimbabwe.. |
| Ano: 2008 |
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| Caron, Alexandre; UPR AGIRs, Department ES, Cirad, Harare Zimbabwe; UPR AGIRs, Department ES, Cirad, Montpellier France; Mammal Research Institute, Department of Entomology and Zoology, University of Pretoria, Pretoria, South Africa; alexandre.caron@cirad.fr; de Garine-Wichatitsky, Michel; UPR AGIRs, Deparmtent ES, Cirad, Harare, Zimbabwe; UPR AGIRs, Department ES, Cirad, Montpellier, France; degarine@cirad.fr; Gaidet, Nicolas; UPR AGIRs, Department ES, Cirad, Montpellier, France; nicolas.gaidet-drapier@cirad.fr; Chiweshe, Ngoni; UPR AGIRs, Department ES, Cirad, Harare, Zimbabwe; chiweshen@yahoo.co.uk; Cumming, Graeme S; Percy Fitz-Patrick Institute, DST/NRF Center of Excellence, University of Cape Town; Graeme.Cumming@uct.ac.za. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Avian influenza; Bridge species; Community ecology; Risk factor; Wild/domestic interface. |
| Ano: 2010 |
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| Si, Yali; Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente; Resource Ecology Group, Wageningen University; School of Resources and Environmental Science, Wuhan University; yali@itc.nl; Wang, Tiejun; Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente; tiejun@itc.nl; Skidmore, Andrew K.; Faculty of Geo-Information Science and Earth Observation (ITC), University of Twente; skidmore@itc.nl; de Boer, Willem F. ; Resource Ecology Group, Wageningen University; Fred.deBoer@wur.nl; Li, Lin; School of Resources and Environmental Science, Wuhan University; lilin@whu.edu.cn; Prins, Herbert H.T.; Resource Ecology Group, Wageningen University; herbert.prins@wur.nl. |
| A large number of occurrences of the highly pathogenic avian influenza (HPAI) H5N1 virus in wild birds were reported in Europe. The relationship between the occurrence pattern and environmental factors has, however, not yet been explored. This research uses logistic regression to quantify the relationships between anthropogenic or physical environmental factors and HPAI H5N1 occurrences. Our results indicate that HPAI H5N1 occurrences are highly correlated with the following: the increased normalized difference vegetation index (NDVI) in December; intermediate NDVI in March; lower elevations; increased minimum temperatures in January; and reduced precipitation in January. A predictive risk map of HPAI H5N1 occurrences in wild birds in Europe was generated... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Avian influenza; Anthropogenic environmental factor; Europe; HPAI H5N1; Physical environmental factor; Risk mapping; Wild birds. |
| Ano: 2010 |
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| Peterson, A. Townsend; ; town@ku.edu; Williams, Richard A. J.; ; ricw@ku.edu. |
| The rapid emergence and spread of highly pathogenic H5N1 avian influenza begs effective and accurate mapping of current knowledge and future risk of infection. Methods for such mapping, however, are rudimentary, and few good examples exist for use as templates for risk-mapping efforts. We review the transmission cycle of avian influenza viruses, and identify points on which risk-mapping can focus. We provide examples from the literature and from our work that illustrate mapping risk based on (1) avian influenza case occurrences, (2) poultry distributions and movements, and (3) migratory bird movements. |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Avian influenza; Land birds; Poultry; Risk mapping; Wild birds.. |
| Ano: 2008 |
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| Liu, Kang Ernest; Huang, Min-Hsin; Hsu, Jane Lu; Lee, Hwang-Jaw. |
| A highly pathogenic H5N1 strain of avian influenza (AI) has been confirmed in 420 human cases and has caused 257 deaths in the world starting from 2003. Using face-to-face interviews, our data were collected by utilizing a stratified sampling scheme following the distribution of gender and age in three major metropolitan areas in Taiwan, including Taipei, Taichung, and Kaohsiung. The questionnaire was designed to retrieve information including AI knowledge, risk perceptions, and behavioral changes of two types of consumers, primary shoppers and general consumers. In total, 501 primary shoppers and 505 general consumers completed the survey in June 2007 and were recorded for analysis. The empirical results show several interesting findings, especially, that... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Avian influenza; Knowledge; Risk perception; Tobit model; Taiwan; Consumer/Household Economics; Livestock Production/Industries; M30. |
| Ano: 2009 |
URL: http://purl.umn.edu/49297 |
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| Hassouneh, Islam; Radwan, Amr; Serra, Teresa; Gil, Jose Maria. |
| In recent years, health risks have received increasing attention among consumers and created interest in analysing the relationship between food scares, food consumption and market prices. One of the most relevant and recent food scares is the avian influenza that has had important effects not only on human and animal health, but also on the economy. We assess effects of avian influenza on price transmission along the Egyptian poultry marketing chain. Although Egypt has been one of the most affected countries by avian influenza, this article is the first attempt to understand this food scare’s impacts on Egyptian poultry markets. In doing so, a multivariate smooth transition vector error correction model (STVECM) is applied to monthly poultry price data.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Food scare; Avian influenza; Price transmission; Egypt.; Production Economics; C22; Q13. |
| Ano: 2010 |
URL: http://purl.umn.edu/91830 |
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| Longworth, Natasha; Jongeneel, Roelof A.; Saatkamp, H.W.; Huirne, Ruud B.M.. |
| The new EU Animal Health Strategy suggests a shift in emphasis away from control towards prevention and surveillance activities for the management of threats to animal health. The optimal combination of these actions will differ among diseases and depend on largely unknown and uncertain costs and benefits. This paper reports an empirical investigation of this issue for the case of Avian Influenza. The results suggest that the optimal combination of actions will be dependent on the objective of the decision maker and that conflict exists between an optimal strategy which minimises costs to the government and one which maximises producer profits or minimises negative effects on human health. From the perspective of minimising the effects on human health,... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Avian influenza; Prevention; Control; Livestock Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/44200 |
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| You, Liangzhi; Diao, Xinshen. |
| In this paper, the authors analyze the potential economic impacts of avian influenza (AI) in West Africa, taking Nigeria as an example. They find that, depending on the size of the affected areas, the direct impact of the spread of AI along the two major migratory bird flyways would be the loss of about 4 percent of national chicken production. However, the indirect effect-consumers’ reluctance to consume poultry if AI is detected, causing a decline in chicken prices-is generally larger than the direct effect. The study estimates that Nigerian chicken production would fall by 21 percent and chicken farmers would lose US$250 million of revenue if the worst-case scenario occurred. The negative impact of AI would be unevenly distributed in the country, and... |
| Tipo: Report |
Palavras-chave: Avian influenza; Spatial equilibrium model simulation; West Africa; Nigeria; Livestock Production/Industries. |
| Ano: 2006 |
URL: http://purl.umn.edu/55399 |
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| Elbakidze, Levan. |
| This study presents a conceptual model for the analysis of avian influenza mitigation options within the small poultry farm sector (backyard flocks). The proposed model incorporates epidemiological susceptible-infected-recovered (SIR) methodology into an economic cost-minimization framework. The model is used to investigate the implications and interdependencies of mitigation options that influence inter-flock contact rates of asymptomatic and symptomatic flocks, and reduce the duration of symptomatic and asymptomatic periods. The results indicates that for shorter asymptomatic periods the efforts to control inter-flock contract rates should concentrate on symptomatic flocks, while for longer asymptomatic periods the control of inter-flock contacts should... |
| Tipo: Journal Article |
Palavras-chave: Asymptomatic and symptomatic periods; Avian influenza; Contact rates; Cost minimization; Livestock Production/Industries. |
| Ano: 2008 |
URL: http://purl.umn.edu/42463 |
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| Registros recuperados: 26 | |
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