Associations between attributes of live poultry trade and HPAI H5N1 outbreaks: a descriptive and network analysis study in northern Vietnam

The structure of contact between individuals plays an important role in the incursion and spread of contagious diseases in both human and animal populations. In the case of avian influenza, the movement of live birds is a well known risk factor for the geographic dissemination of the virus among poultry flocks.

Live bird markets (LBMs) contribute to the epidemiology of avian influenza due to their demographic characteristics and the presence of HPAI H5N1 virus lineages. The relationship between poultry producers and live poultry traders (LPTs) that operate in LBMs has not been adequately documented in HPAI H5N1-affected SE Asian countries.

The aims of this study were to document and study the flow of live poultry in a poultry trade network in northern Vietnam, and explore its potential role in the risk for HPAI H5N1 during 2003 to 2006.

Results: Our results indicate that LPTs trading for less than a year and operating at retail markets are more likely to source poultry from flocks located in communes with a past history of HPAI H5N1 outbreaks during 2003 to 2006 than LPTs trading longer than a year and operating at wholesale markets. The results of the network analysis indicate that LPTs tend to link communes of similar infection status.

Conclusions: Our study provides evidence which can be used for informing policies aimed at encouraging more biosecure practices of LPTs operating at authorised LBMs.

The results suggest that LPTs play a role in HPAI H5N1 transmission and may contribute to perpetuating HPAI H5N1 virus circulation amongst certain groups of communes. The impact of current disease prevention and control interventions could be enhanced by disseminating information about outbreak risk and the implementation of a formal data recording scheme at LBMs for all incoming and outgoing LPTs.

Author: Ricardo Soares MagalhaesAngel Ortiz-PelaezKim Lan Lai ThiQuoc Hoang DinhJoachim OtteDirk Pfeiffer
Credits/Source: BMC Veterinary Research 2010, 6:10

Published on: 2010-02-22

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