Spatio-temporal epidemiology of highly pathogenic avian influenza outbreaks in the two deltas of Vietnam during 2003–2007

Minh, Phạm Quang; Morris, Roger S.; Schauer, Birgit; Stevenson, M.A.; Benschop, Jackie; Nam, Hoang V.; Jackson, Ron

doi:10.1016/j.prevetmed.2009.01.004

Cited by 74 publications

(81 citation statements)

References 14 publications

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“…Lower elevation areas were more vulnerable to increased risk of contracting the disease in Europe and Thailand [1,6]. Increased duck and chicken density were thought to increase the incidence of the disease in Thailand and Vietnam [4][5][6]11].…”

Section: Discussionmentioning

confidence: 99%

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Spatio-Temporal Occurrence Modeling of Highly Pathogenic Avian Influenza Subtype H5N1: A Case Study in the Red River Delta, Vietnam

Tran

Yost

Yanagida

et al. 2013

IJGI

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Highly Pathogenic Avian Influenza (HPAI) subtype H5N1 poses severe threats to both animals and humans. Investigating where, when and why the disease occurs is important to help animal health authorities develop effective control policies. This study takes into account spatial and temporal occurrence of HPAI H5N1 in the Red River Delta of Vietnam. A two-stage procedure was used: (1) logistic regression modeling to identify and quantify factors influencing the occurrence of HPAI H5N1; and (2) a geostatistical approach to develop monthly predictive maps. The results demonstrated that higher average monthly temperatures and poultry density in combination with lower average monthly precipitation, humidity in low elevation areas, roughly from November to January and April to June, contribute to the higher occurrence of HPAI H5N1. Provinces near the Gulf of Tonkin, including Hai Phong, Hai Duong, Thai Binh, Nam Dinh and Ninh Binh are areas with higher probability of occurrence of HPAI H5N1.

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Section: Discussionmentioning

confidence: 99%

“…Records of past occurrences are incorporated with environmental and anthropogenic factors to predict probabilities and map the spatio-temporal distribution of HPAI H5N1. The study focuses on the Red River Delta in Vietnam, which was previously defined as a high-risk area for the disease [4,11].…”

Section: Introductionmentioning

confidence: 99%

Spatio-Temporal Occurrence Modeling of Highly Pathogenic Avian Influenza Subtype H5N1: A Case Study in the Red River Delta, Vietnam

Tran

Yost

Yanagida

et al. 2013

IJGI

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“…By the end of 2009, five epidemic waves had occurred in domestic poultry [2]. The HPAI H5N1 viruses isolated in Vietnam from the initial outbreaks belonged to haemagglutinin (HA) clade 1 (genotype z) [3,4] according to the nomenclature system of the HA lineage protein gene [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the vaccination efficacy against H5N1 in domestic poultry in the Red River Delta in Vietnam

et al. 2012

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SUMMARYThe domestic poultry population in Vietnam has been vaccinated against highly pathogenic avian influenza (HPAI) H5N1 since 2005. Since then, outbreaks have continued to occur without a clear understanding of the mechanisms involved. The general objective of this study was to understand the epidemiology of the disease in the context of vaccination and to draw some conclusions about vaccination efficacy in the domestic poultry population of the Red River Delta area. Five cross-sectional surveys to measure the serological and virological prevalence in vaccinated and unvaccinated poultry were performed from the end of 2008 to June 2010. The global seroprevalence was 24 % (95 % confidence interval 19 . 9-28 . 2). Determinants of vaccine immunogenicity were identified separately in chickens and ducks as well as determinants of the seroconversion in unvaccinated birds. The results highlight the difficulties in maintaining good flock immunity in poultry populations using inactivated vaccine in the field with two vaccination rounds per year, and in preventing circulation of virus in co-existing unvaccinated poultry.

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“…Since late (Minh et al, 2009, Pfeiffer et al, 2007. Since then, the epidemic waves of H5N1 among poultry had apparently subsided and the cases have been absent for approximately 14 months until the end of May 2007 when the 4 th epidemic wave was identified in the Red River Delta (Minh et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Since then, the epidemic waves of H5N1 among poultry had apparently subsided and the cases have been absent for approximately 14 months until the end of May 2007 when the 4 th epidemic wave was identified in the Red River Delta (Minh et al, 2009). Lee et al (2004) reported that long-term use of avian influenza vaccine among poultry in Mexico has aided the emergence of viruses with multiple sublineages separated from that of vaccine strain and subsequently allowed the newly emerged H5N2 strains spread to adjacent countries.…”

Section: Introductionmentioning

confidence: 99%

Molecular epidemiology of avian influenza viruses circulating among healthy poultry flocks in farms in northern Vietnam

Takakuwa

Yamashiro

et al. 2012

Preventive Veterinary Medicine

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Spatio-temporal epidemiology of highly pathogenic avian influenza outbreaks in the two deltas of Vietnam during 2003–2007

Cited by 74 publications

References 14 publications

Spatio-Temporal Occurrence Modeling of Highly Pathogenic Avian Influenza Subtype H5N1: A Case Study in the Red River Delta, Vietnam

Spatio-Temporal Occurrence Modeling of Highly Pathogenic Avian Influenza Subtype H5N1: A Case Study in the Red River Delta, Vietnam

Evaluation of the vaccination efficacy against H5N1 in domestic poultry in the Red River Delta in Vietnam

Molecular epidemiology of avian influenza viruses circulating among healthy poultry flocks in farms in northern Vietnam

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