Protein & Cell

, Volume 1, Issue 1, pp 9–13 | Cite as

The emergence of pandemic influenza viruses

  • Yi Guan
  • Dhanasekaran Vijaykrishna
  • Justin Bahl
  • Huachen Zhu
  • Jia Wang
  • Gavin J. D. Smith
Mini-Review

Abstract

Pandemic influenza has posed an increasing threat to public health worldwide in the last decade. In the 20th century, three human pandemic influenza outbreaks occurred in 1918, 1957 and 1968, causing significant mortality. A number of hypotheses have been proposed for the emergence and development of pandemic viruses, including direct introduction into humans from an avian origin and reassortment between avian and previously circulating human viruses, either directly in humans or via an intermediate mammalian host. However, the evolutionary history of the pandemic viruses has been controversial, largely due to the lack of background genetic information and rigorous phylogenetic analyses. The pandemic that emerged in early April 2009 in North America provides a unique opportunity to investigate its emergence and development both in human and animal aspects. Recent genetic analyses of data accumulated through long-term influenza surveillance provided insights into the emergence of this novel pandemic virus. In this review, we summarise the recent literature that describes the evolutionary pathway of the pandemic viruses. We also discuss the implications of these findings on the early detection and control of future pandemics.

Keywords

pandemic influenza influenza virus pandemics control 

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Copyright information

© Higher Education Press and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  • Yi Guan
    • 1
  • Dhanasekaran Vijaykrishna
    • 1
  • Justin Bahl
    • 1
  • Huachen Zhu
    • 1
  • Jia Wang
    • 1
  • Gavin J. D. Smith
    • 1
  1. 1.State Key Laboratory of Emerging Infectious Diseases, Li Ka Shing Faculty of MedicineThe University of Hong KongHong Kong SARChina

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