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. 2011:2011:206975.
doi: 10.1155/2011/206975. Epub 2012 Jan 3.

Experiences after Twenty Months with Pandemic Influenza A (H1N1) 2009 Infection in the Naïve Norwegian Pig Population

B Gjerset  1 , C Er, S Løtvedt, A Jørgensen, O Hungnes, B Lium, A Germundsson
Affiliations

Experiences after Twenty Months with Pandemic Influenza A (H1N1) 2009 Infection in the Naïve Norwegian Pig Population

B Gjerset et al. Influenza Res Treat. 2011.

Abstract

Pandemic (H1N1) 2009 influenza A virus was detected in Norwegian pigs in October 2009. Until then, Norway was regarded free of swine influenza. Intensified screening revealed 91 positive herds within three months. The virus was rapidly transmitted to the susceptible population, including closed breeding herds with high biosecurity. Humans were important for the introduction as well as spread of the virus to pigs. Mild or no clinical signs were observed in infected pigs. Surveillance of SIV in 2010 revealed that 41% of all the Norwegian pig herds had antibodies to pandemic (H1N1) 2009 virus. Furthermore, this surveillance indicated that pigs born in positive herds after the active phase did not seroconvert, suggesting no ongoing infection in the herds. However, results from surveillance in 2011 show a continuing spread of the infection in many herds, either caused by new introduction or by virus circulation since 2009.

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Figures

Figure 1
Figure 1
Map of Norway showing increasing number of herds tested positive for pandemic (H1N1) 2009 infection against the pig farming density by county (pig herds per km2).
See this image and copyright information in PMC

References

    1. Van Reeth K, Brown IH, Dürrwald R, et al. Seroprevalence of H1N1, H3N2 and H1N2 influenza viruses in pigs in seven European countries in 2002-2003. Influenza and other Respiratory Viruses. 2008;2(3):99–105. - PMC - PubMed
    1. Maldonado J, Van Reeth K, Riera P, et al. Evidence of the concurrent circulation of H1N2, H1N1 and H3N2 influenza A viruses in densely populated pig areas in Spain. Veterinary Journal. 2006;172(2):377–381. - PubMed
    1. Brown IH. The epidemiology and evolution of influenza viruses in pigs. Veterinary Microbiology. 2000;74(1-2):29–46. - PubMed
    1. Garten RJ, Davis CT, Russell CA, et al. Antigenic and genetic characteristics of swine-origin 2009 A(H1N1) influenza viruses circulating in humans. Science. 2009;325(5937):197–201. - PMC - PubMed
    1. Cohen J. Swine flu outbreak. New details on virus’s promiscuous past. Science. 2009;324(5931):p. 1127. - PubMed

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