Severity of pneumonia due to new H1N1 influenza virus in ferrets is intermediate between that due to seasonal H1N1 virus and highly pathogenic avian influenza H5N1 virus

Judith M A van den Brand, Koert J Stittelaar, Geert van Amerongen, Guus F Rimmelzwaan, James Simon, Emmie de Wit, Vincent J Munster, Theo M Bestebroer, Ron A M Fouchier, Thijs Kuiken, Albert D M E Osterhaus

    Research output: Contribution to journalArticleAcademicpeer-review

    Abstract

    BACKGROUND: The newly emerged influenza A(H1N1) virus (new H1N1 virus) is causing the first influenza pandemic of this century. Three influenza pandemics of the previous century caused variable mortality, which largely depended on the development of severe pneumonia. However, the ability of the new H1N1 virus to cause pneumonia is poorly understood.

    METHODS: The new H1N1 virus was inoculated intratracheally into ferrets. Its ability to cause pneumonia was compared with that of seasonal influenza H1N1 virus and highly pathogenic avian influenza (HPAI) H5N1 virus by using clinical, virological, and pathological analyses.

    RESULTS: Our results showed that the new H1N1 virus causes pneumonia in ferrets intermediate in severity between that caused by seasonal H1N1 virus and by HPAI H5N1 virus. The new H1N1 virus replicated well throughout the lower respiratory tract and more extensively than did both seasonal H1N1 virus (which replicated mainly in the bronchi) and HPAI H5N1 virus (which replicated mainly in the alveoli). High loads of new H1N1 virus in lung tissue were associated with diffuse alveolar damage and mortality.

    CONCLUSIONS: The new H1N1 virus may be intrinsically more pathogenic for humans than is seasonal H1N1 virus.

    Original languageEnglish
    Pages (from-to)993-9
    Number of pages7
    JournalJournal of Infectious Diseases
    Volume201
    Issue number7
    DOIs
    Publication statusPublished - 1 Apr 2010

    Keywords

    • Analysis of Variance
    • Animals
    • Body Temperature
    • Body Weight
    • Cell Line
    • Female
    • Ferrets
    • Immunohistochemistry
    • Influenza A Virus, H1N1 Subtype
    • Influenza A Virus, H5N1 Subtype
    • Lung
    • Male
    • Organ Size
    • Orthomyxoviridae Infections
    • Pneumonia, Viral
    • Severity of Illness Index
    • Viral Load
    • Journal Article
    • Research Support, Non-U.S. Gov't

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