Analysis of avian Usutu virus infections in Germany from 2011 to 2018 with focus on dsRNA detection to demonstrate viral infections.

Autor: Störk T; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany., de le Roi M; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany., Haverkamp AK; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany., Jesse ST; Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hanover, Hanover, Germany., Peters M; Chemisches Und Veterinäruntersuchungsamt Westfalen, Arnsberg, Germany., Fast C; Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Novel and Emerging Infectious Diseases, Greifswald-Insel Riems, Germany., Gregor KM; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany., Könenkamp L; Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hanover, Hanover, Germany.; Institute for Biochemistry, University of Veterinary Medicine Hanover, Hanover, Germany., Steffen I; Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hanover, Hanover, Germany.; Institute for Biochemistry, University of Veterinary Medicine Hanover, Hanover, Germany., Ludlow M; Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hanover, Hanover, Germany., Beineke A; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany., Hansmann F; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany.; Institute of Veterinary-Pathology, Leipzig University, Leipzig, Germany., Wohlsein P; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany., Osterhaus ADME; Research Center for Emerging Infections and Zoonoses, University of Veterinary Medicine Hanover, Hanover, Germany., Baumgärtner W; Department of Pathology, University of Veterinary Medicine Hanover Foundation, Bünteweg 17, 30559, Hannover, Germany. Wolfgang.Baumgaertner@tiho-hannover.de.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2021 Dec 17; Vol. 11 (1), pp. 24191. Date of Electronic Publication: 2021 Dec 17.
DOI: 10.1038/s41598-021-03638-5
Abstrakt: Usutu virus (USUV) is a zoonotic arbovirus causing avian mass mortalities. The first outbreak in North-Western Germany occurred in 2018. This retrospective analysis focused on combining virological and pathological findings in birds and immunohistochemistry. 25 common blackbirds, one great grey owl, and one kingfisher collected from 2011 to 2018 and positive for USUV by qRT-PCR were investigated. Macroscopically, most USUV infected birds showed splenomegaly and hepatomegaly. Histopathological lesions included necrosis and lymphohistiocytic inflammation within spleen, Bursa fabricii, liver, heart, brain, lung and intestine. Immunohistochemistry revealed USUV antigen positive cells in heart, spleen, pancreas, lung, brain, proventriculus/gizzard, Bursa fabricii, kidney, intestine, skeletal muscle, and liver. Analysis of viral genome allocated the virus to Europe 3 or Africa 2 lineage. This study investigated whether immunohistochemical detection of double-stranded ribonucleic acid (dsRNA) serves as an alternative tool to detect viral intermediates. Tissue samples of six animals with confirmed USUV infection by qRT-PCR but lacking viral antigen in liver and spleen, were further examined immunohistochemically. Two animals exhibited a positive signal for dsRNA. This could indicate either an early state of infection without sufficient formation of virus translation products, occurrence of another concurrent virus infection or endogenous dsRNA not related to infectious pathogens and should be investigated in more detail in future studies.
(© 2021. The Author(s).)
Databáze: MEDLINE
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