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Usutu virus activity in Austria, 2001-2002.

Herbert Weissenböck1, Jolanta Kolodziejek, Karin Fragner

  • 1Institute of Pathology and Forensic Veterinary Medicine, University of Veterinary Medicine, Vienna, Veterinärplatz 1, A-1210 Vienna, Austria. herbert.weissenboeck@vu-wien.ac.at

Microbes and Infection
|October 14, 2003
PubMed
Summary
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Usutu virus (USUV) caused significant avian mortality in Austria, particularly in blackbirds. Monitoring dead blackbirds proved effective for tracking USUV activity and its establishment in the region.

Area of Science:

  • Veterinary Virology
  • Ecology and Epidemiology
  • Wildlife Disease Surveillance

Background:

  • Usutu virus (USUV), a Flaviviridae family member, is transmitted by mosquitoes.
  • USUV caused notable avian mortality in Austria during 2001 and 2002.
  • Blackbirds were identified as a predominant species affected by the virus.

Purpose of the Study:

  • To investigate the persistence and spread of Usutu virus in Austria.
  • To evaluate the effectiveness of dead blackbird surveillance for USUV monitoring.
  • To determine the geographic distribution and overwintering capability of USUV in Austria.

Main Methods:

  • Laboratory examination of 72 submitted avian carcasses.
  • Immunohistochemistry and polymerase chain reaction (PCR) for USUV detection.

Related Experiment Videos

  • Geographic mapping of confirmed USUV cases in Austrian federal states.

    • Main Results:

    • 30 out of 72 birds tested positive for USUV.
    • Confirmed USUV infections were concentrated in Vienna and Lower Austria.
    • Evidence suggests USUV overwintered and established a transmission cycle in Austria.

    Conclusions:

    • Usutu virus has become an established pathogen in Austria with potential for further spread.
    • The surveillance of dead blackbirds serves as a valuable sentinel system for USUV activity.
    • Further research is needed to understand the long-term ecological impact of USUV in Austria.