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The first identified case of pandemic H1N1 influenza in pigs in Australia

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  • The first identified case of pandemic H1N1 influenza in pigs in Australia

    The first identified case of pandemic H1N1 influenza in pigs in Australia

    PK Holyoake1,
    PD Kirkland2,
    RJ Davis2,
    KE Arzey2,
    J Watson3,
    RA Lunt3,
    J Wang3,
    F Wong3,
    BJ Moloney4,
    SE Dunn4

    Article first published online: 18 OCT 2011

    DOI: 10.1111/j.1751-0813.2011.00844.x


    A 300-sow farrow-to-finish herd in New South Wales was infected with influenza pandemic (H1N1) 2009 (H1N1/09) virus in July 2009 and became the first recorded case of influenza in pigs in Australia. The outbreak resulted from human-to-pig transmission. Clinical signs in affected pigs were mild compared with overseas reports of ?classical? swine influenza virus and included coughing and decreased appetite in a small proportion of non-lactating breeding stock, weaners, growers and finishers. A diagnosis of H1N1/09 influenza virus infection was confirmed using a combination of serology (haemagglutination inhibition, blocking enzyme-linked immunosorbent assay) and real-time reverse transcription polymerase chain reaction. Attempts at virus isolation were unsuccessful. Results of a longitudinal study of pigs on this farm suggested that the virus continued to circulate for 9 weeks after the onset of infection, but was not present 6 months later. This report highlights the difficulties in preventing transmission of H1N1/09 influenza virus from infected humans to pigs during a human pandemic.

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