生鳥市場における高病原性鳥インフルエンザに対する衛生向上のためのリスク分析

2016 Fiscal Year Annual Research Report

• Project/Area Number: 16J06369
• Research Institution: Hokkaido University
• Principal Investigator: CHU DUC HUY 北海道大学, (連合)獣医学研究科, 特別研究員(DC2)
• Project Period (FY): 2016-04-22 – 2018-03-31
• Keywords: avian influenza virus / live bird market / risk analysis / transmission

Outline of Annual Research Achievements

This fiscal year, we focused on the following research to evaluate the current interventions on live bird market (LBM) in order to minimize the risk of avian influenza virus (AIV) transmission to poultry and humans.
The characteristics of LBMs with improved infrastructure were compared with those operating in a routine manner in Vietnam. The study showed that various subtypes of AIVs were isolated during surveillance of LBMs with or without intervention. In addition, H5N6 highly pathogenic avian influenza viruses (HPAIVs) were isolated from apparently healthy ducks, Muscovy ducks and environmental samples in one of the intervention LBMs. And the prevalence of AIVs in intervention LBMs was similar to that in non-intervention LBMs. These results suggest that the interventions currently applied in LBMs in center part of Vietnam are insufficient to control avian influenza.
To identify the factors contributing to AIVs circulation in both types of LBMs, this focused on quantification of bird-, poultry seller- and market-level characteristics that rendered individual birds more likely to be AIV isolation positive at the time of sale. The results demonstrate that after adjusting for clustering at the market- and individual seller-level none of the explanatory variables solicited in the questionnaire were significantly associated with AIV positivity. A relatively small component of the variation in AIV positivity risk was at the individual market-level. It indicates that the emphasis of avian influenza control efforts should be at the seller-level rather than market-level.

Research Progress Status

翌年度、交付申請を辞退するため、記入しない。

Strategy for Future Research Activity

翌年度、交付申請を辞退するため、記入しない。

Research Products

• [Int'l Joint Research] Depertment of animal health(ベトナム)
  • Country Name: VIET NAM
  • Counterpart Institution: Depertment of animal health
• [Int'l Joint Research] University of Melbourne(オーストラリア)
  • Country Name: AUSTRALIA
  • Counterpart Institution: University of Melbourne
• [Journal Article] A cross-sectional study to quantify the prevalence of avian influenza viruses in poultry at intervention and non-intervention live bird markets in central Vietnam, 2014. (2017)
  • Author(s): Chu DH, Stevenson MA, Nguyen LV, Isoda N, Firestone SM, Nguyen TN, Nguyen LT, Matsuno K, Okamatsu M, Kida H, Sakoda Y.
  • Journal Title: Transbound Emerg Dis. Volume: 印刷中 Pages: 印刷中
  • DOI: 10.1111/tbed.12605.
  • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] 3. Genetic and antigenic characterization of H5, H6 and H9 avian influenza viruses circulating in live bird markets with intervention in the center part of Vietnam. (2016)
  • Author(s): Chu DH, Okamatsu M, Matsuno K, Hiono T, Ogasawara K, Nguyen LT, Van Nguyen L, Nguyen TN, Nguyen TT, Van Pham D, Nguyen DH, Nguyen TD, To TL, Van Nguyen H, Kida H, Sakoda Y.
  • Journal Title: Vet Microbiol. Volume: 192 Pages: 194-203
  • DOI: 10.1016/j.vetmic.2016.07.016.
  • Peer Reviewed / Int'l Joint Research
• [Presentation] Risk analysis for avian influenza in live bird markets in central Vietnam in 2014 (2016)
  • Author(s): Chu DH, Stevenson MA, Nguyen LV, Isoda N, Firestone SM, Nguyen TN, Nguyen LT, Matsuno K, Okamatsu M, Kida H, Sakoda Y.
  • Organizer: The 4th Sapporo Summer Seminar for One Health
  • Place of Presentation: 北海道大学大学院獣医学研究科講堂, 札幌
  • Year and Date: 2016-09-20 – 2016-09-22