Comparative Epidemiology of Highly Pathogenic Avian Influenza Virus H5N1 and H5N6 in Vietnamese Live Bird Markets: Spatiotemporal Patterns of Distribution and Risk Factors

被引:15
作者
Mellor, Kate C. [1 ]
Meyer, Anne [1 ]
Elkholly, Doaa A. [1 ]
Fournie, Guillaume [1 ]
Long, Pham T. [2 ]
Inui, Ken [3 ]
Padungtod, Pawin [3 ]
Gilbert, Marius [4 ]
Newman, Scott H. [3 ,5 ,9 ]
Vergne, Timothee [1 ,6 ,7 ]
Pfeiffer, Dirk U. [1 ,8 ]
Stevens, Kim B. [1 ]
机构
[1] Royal Vet Coll, Vet Epidemiol Econ & Publ Hlth Grp, Dept Pathobiol & Populat Sci, Hatfield, Herts, England
[2] Minist Agr & Rural Dev, Dept Anim Hlth, Hanoi, Vietnam
[3] UN, Country Off Vietnam, Food & Agr Org, Hanoi, Vietnam
[4] Univ Libre Bruxelles, Spatial Epidemiol Lab, Brussels, Belgium
[5] UN, Country Off Ethiopia, Food & Agr Org, Addis Ababa, Ethiopia
[6] IRD, MIVEGEC, Montpellier, France
[7] Univ Toulouse, UMR INRA 1225, ENVT Interact Hotes Agents Pathogenes IHAP, Toulouse, France
[8] City Univ Hong Kong, Coll Vet Med & Life Sci, Kowloon, Hong Kong, Peoples R China
[9] UN, Reg Off Africa, Food & Agr Org, Accra, Ghana
基金
英国自然环境研究理事会; 英国生物技术与生命科学研究理事会; 英国经济与社会研究理事会; 英国医学研究理事会;
关键词
avian influenza; epidemiology; live bird markets; poultry; spatial modelling; Vietnam; emerging infectious disease; POULTRY MARKETS; MUSCOVY DUCKS; VACCINATION; INFECTION; OUTBREAKS; SUBTYPE; PEKIN;
D O I
10.3389/fvets.2018.00051
中图分类号
S85 [动物医学(兽医学)];
学科分类号
0906 ;
摘要
Highly pathogenic avian influenza (HPAI) H5N1 virus has been circulating in Vietnam since 2003, whilst outbreaks of HPAI H5N6 virus are more recent, having only been reported since 2014. Although the spatial distribution of H5N1 outbreaks and risk factors for virus occurrence has been extensively studied, there have been no comparative studies for H5N6. Data collected through active surveillance of Vietnamese live bird markets (LBMs) between 2011 and 2015 were used to explore and compare the spatiotemporal distributions of H5N1- and H5N6-positive LBMs. Conditional autoregressive models were developed to quantify spatiotemporal associations between agroecological factors and the two HPAI strains using the same set of predictor variables. Unlike H5N1, which exhibited a strong north-south divide, with repeated occurrence in the extreme south of a cluster of high-risk provinces, H5N6 was homogeneously distributed throughout Vietnam. Similarly, different agroecological factors were associated with each strain. Sample collection in the months of January and February and higher average maximum temperature were associated with higher likelihood of H5N1-positive market-day status. The likelihood of market days being positive for H5N6 increased with decreased river density, and with successive Rounds of data collection. This study highlights marked differences in spatial patterns and risk factors for H5N1 and H5N6 in Vietnam, suggesting the need for tailored surveillance and control approaches.
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页数:13
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