Seroprevalence survey of avian influenza A(H5N1) among live poultry market workers in northern Viet Nam, 2011

Authors

  • Dung Chi Tham National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
  • Ngoc Dinh Pham National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
  • Sinh Nam Vu Department of Preventive Medicine, Ministry of Health, Hanoi, Viet Nam
  • Minh Tan Luong National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
  • Khanh Hang Nguyen Le National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
  • Thi Thanh Le National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam
  • Mai Quynh Le National Institute of Hygiene and Epidemiology, Hanoi, Viet Nam

DOI:

https://doi.org/10.5365/wpsar.2014.5.2.006

Abstract

Objective: Highly pathogenic avian influenza A(H5N1) is endemic in poultry in Viet Nam. The country has experienced the third highest number of human infections with influenza A(H5N1) in the world. A study in Hanoi in 2001, before the epizootic that was identified in 2003, found influenza A(H5N1) specific antibodies in 4% of poultry market workers (PMWs). We conducted a seroprevalence survey to determine the seroprevalence of antibodies to influenza A(H5N1) among PMWs in Hanoi, Thaibinh and Thanhhoa provinces.

Methods: We selected PMWs from five markets, interviewed them and collected blood samples. These were then tested using a horse haemagglutination inhibition assay and a microneutralization assay with all three clades of influenza A(H5N1) viruses that have circulated in Viet Nam since 2004.

Results: The overall seroprevalence was 6.1% (95% confidence interval: 4.6–8.3). The highest proportion (7.2%) was found in PMWs in Hanoi, and the majority of seropositive subjects (70.3%) were slaughterers or sellers of poultry.

Discussion: The continued circulation and evolution of influenza A(H5N1) requires comprehensive surveillance of both human and animal sites throughout the country with follow-up studies on PMWs to estimate the risk of avian–human transmission of influenza A(H5N1) in Viet Nam.

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Published

18-11-2014

How to Cite

1.
Tham DC, Pham ND, Vu SN, Luong MT, Nguyen Le KH, Le TT, Le MQ. Seroprevalence survey of avian influenza A(H5N1) among live poultry market workers in northern Viet Nam, 2011. Western Pac Surveill Response J [Internet]. 2014 Nov. 18 [cited 2026 Mar. 25];5(4). Available from: https://ojs.wpro.who.int/ojs/index.php/wpsar/article/view/260

Issue

Vol. 5 No. 4 (2014): October – December

Section

Original Research

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