Transmission of pandemic influenza H1N1 (2009) in Vietnamese swine in 2009-2010

Trévennec Karen, Leger Lucas, Lyazrhi Faouzi, Baudon Eugénie, Cheung Chung Yan, Roger François, Peiris Malik, Garcia Jean-Michel. 2012. Transmission of pandemic influenza H1N1 (2009) in Vietnamese swine in 2009-2010. Influenza and Other Respiratory Viruses, 6 (5) : pp. 348-357.

Journal article ; Article de revue à facteur d'impact
Published version - Anglais
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Quartile : Q4, Sujet : INFECTIOUS DISEASES / Quartile : Q4, Sujet : VIROLOGY

Abstract : Background The pandemic of 2009 was caused by an H1N1 (H1N1pdm) virus of swine origin. This pandemic virus has repeatedly infected swine through reverse zoonosis, although the extent of such infection in swine remains unclear. Objective This study targets small and commercial pig producers in North Vietnam, in order to estimate the extent of H1N1pdm infection in swine and to identify the risk factors of infection. Methods Virologic and serologic surveillance of swine was carried out in 2009-2010 in pig farms (38 swabs and 1732 sera) and at a pig slaughterhouse (710 swabs and 459 sera) in North Vietnam. The sera were screened using a influenza type A-reactive ELISA assay, and positive sera were tested using hemagglutination inhibition tests for antibody to a panel of H1-subtype viruses representing pandemic (H1N1) 2009 (H1N1pdm), triple reassortant (TRIG), classical swine (CS), and Eurasian avian-like (EA) swine lineages. Farm-level risk factors were identified using a zero-inflated negative binomial model. Results We found a maximal seroprevalence of H1N1pdm of 55Æ6% [95% CI: 38Æ1-72Æ1] in the slaughterhouse at the end of December 2009, 2 weeks after the peak of reported human fatalities with H1N1pdm. Farm-level seroprevalence was 29% [95% CI: 23Æ2-35Æ7]. In seropositive farms, within-herd seroprevalence ranged from 10 to 100%. We identified an increased risk of infection for farms that specialized in fattening and a decreased risk of infection in farms hiring external swine workers. Conclusions Our findings suggest extensive reverse-zoonotic transmission from humans to pigs with subsequent onward transmission within pig herds. (Résumé d'auteur)

Mots-clés Agrovoc : Influenzavirus porcin, Épidémiologie, Transmission des maladies, Porcin, Oiseau, Genre humain, Facteur de risque, Densité de population, Sérologie, Virologie, Morbidité, Enquête pathologique, Surveillance épidémiologique

Mots-clés géographiques Agrovoc : Viet Nam

Classification Agris : L73 - Animal diseases
000 - Other themes

Champ stratégique Cirad : Axe 4 (2005-2013) - Santé animale et maladies émergentes

Auteurs et affiliations

  • Trévennec Karen, CIRAD-ES-UPR AGIRs (FRA)
  • Leger Lucas, CIRAD-ES-UPR AGIRs (FRA)
  • Lyazrhi Faouzi, ENVT (FRA)
  • Baudon Eugénie, University of Hong Kong (CHN)
  • Cheung Chung Yan, University of Hong Kong (CHN)
  • Roger François, CIRAD-ES-UPR AGIRs (THA) ORCID: 0000-0002-1573-6833
  • Peiris Malik, University of Hong Kong (CHN)
  • Garcia Jean-Michel, University of Hong Kong (CHN)

Source : Cirad - Agritrop (

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