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Selected Publication:

Publication type: Journal Article
Document type: Full Paper

Year: 2007

Author(s): Chvala, S; Bakonyi, T; Bukovsky, C; Meister, T; Brugger, K; Rubel, F; Nowotny, N; Weissenböck, H

Title: Monitoring of Usutu virus activity and spread by using dead bird surveillance in Austria, 2003-2005.

Source: Vet Microbiol. 2007; 122(3-4):237-245



Authors Vetmeduni Vienna:

Bakonyi Tamas
Brugger Katharina
Chvala-Mannsberger Sonja
Nowotny Norbert
Rubel Franz
Schaller Christiane
Weissenböck Herbert

Vetmed Research Units
Institute of Pathology
Institute of Virology
Unit of Physiology and Biophysics
University Clinic for Swine


Project(s): Continuing surveillance of Usutu virus infection in Austria - geographical spread, susceptible species and recognition of human cases

Application of an mathematical model to explain the Usutu virus dynamics in the region of Vienna


Abstract:
Usutu virus has been causing avian mortality in Austria since its emergence in 2001. Between 2003 and 2005 a total of 504 dead birds were examined by reverse-transcriptase polymerase chain reaction and immunohistochemistry for the presence of Usutu virus nucleic acid and antigen, respectively. In 2003, 92 birds (out of 177 birds) belonging to five different species were positive, while in 2004, only 11 (of 224) birds, and in 2005, 4 (of 103) birds proved positive, all of which were blackbirds (Turdus merula). Within the surveillance period the virus had spread from its initial area of emergence and circulation, the surroundings of Vienna, to large areas of the federal states of Lower Austria, Burgenland and Styria. However, the absolute numbers of Usutu virus associated avian deaths declined significantly during the course of the years. In addition, the proportion of birds with low amounts of virus in their tissues increased continuously, which may indicate developing herd immunity.

Keywords Pubmed: Animals
Animals, Wild/virology
Antigens, Viral/analysis
Austria/epidemiology
Base Sequence
Bird Diseases/epidemiology*
Bird Diseases/mortality*
Bird Diseases/virology
Birds
Flavivirus/isolation & purification*
Flavivirus/pathogenicity
Flavivirus Infections/epidemiology
Flavivirus Infections/mortality
Flavivirus Infections/veterinary*
Immunohistochemistry/veterinary
Molecular Sequence Data
Reverse Transcriptase Polymerase Chain Reaction/methods
Reverse Transcriptase Polymerase Chain Reaction/veterinary
Sentinel Surveillance/veterinary*


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