Issue 4

Journal for Veterinary Medicine, Biotechnology and Biosafety

Volume 1, Issue 4, December 2015, Pages 28–34

ISSN 2411-3174 (print version) ISSN 2411-0388 (online version)

Cellular and humoral mediated immunity and distribution of viral antigens in chickens after infection with a low pathogenic avian influenza virus (LPAIV H4N6) isolated from wild ducks

Stegniy B. T. 1, Muzyka D. V. 1, Shutchenko P. O. 1, Lillehoj H. 2, Kovalenko L. V. 1, Stegniy A. B. 1, Medvid K. O. 1, Rula O. M. 1

1 National Scientific Center ‘Institute of Experimental and Clinical Veterinary Medicine’, Kharkiv, Ukraine, e-mail: dmuzyka77@gmail.com

2 Animal Biosciences and Biotechnology Laboratory, Beltsville Agricultural Research Center, Beltsville, Maryland, USA

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Citation for print version: Stegniy, B. T., Muzyka, D. V., Shutchenko, P. O., Lillehoj, H., Kovalenko, L. V., Stegniy, A. B., Medvid, K. O. and Rula, O. M. (2015) ‘Cellular and humoral mediated immunity and distribution of viral antigens in chickens after infection with a low pathogenic avian influenza virus (LPAIV H4N6) isolated from wild ducks’, Journal for Veterinary Medicine, Biotechnology and Biosafety, 1(4), pp. 28–34.

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Citation for online version: Stegniy, B. T., Muzyka, D. V., Shutchenko, P. O., Lillehoj, H., Kovalenko, L. V., Stegniy, A. B., Medvid, K. O. and Rula, O. M. (2015) ‘Cellular and humoral mediated immunity and distribution of viral antigens in chickens after infection with a low pathogenic avian influenza virus (LPAIV H4N6) isolated from wild ducks’, Journal for Veterinary Medicine, Biotechnology and Biosafety. [Online] 1(4), pp. 28–34. Available at: http://jvmbbs.kharkov.ua/archive/2015/volume1/issue4/oJVMBBS_2015014_028-034.pdf

Summary. Four-week-old commercial chickens were intranasally inoculated with a H4N6 low pathogenic avian influenza virus (LPAIV) isolated from a garganey in Ukraine. The virus did not cause disease in chickens and no pathological changes were observed in inoculated birds. No virus was isolated from internal organs, but 3 chickens of 5 showed antibodies to influenza virus at intranasal infection. Cecum, spleen, lung, and trachea samples were collected from LPAIV-infected chickens from 1 to 14 days post inoculation (dpi) and examined by immunohistochemical techniques to determine the distribution of LPAIV and evaluate the host immune response using various immune markers. From 7 to 14 dpi, a sharp increase of the number of cells bearing CD4, IgM, IgG, and IgA was observed. In spleen, the number of CD4 T lymphocytes and macrophages were increased in immunohistochemical staining when compared to controls. In the lung, B lymphocytes expressing IgM (6.8±0.5%), IgG (9.4±1.3%), and IgA (8.6±0.1%) were detected in higher numbers than in controls. High levels of IFN-γ, IL-2, IL-15 were present on 7 dpi. We also found LPAIV nucleoprotein (NP) staining in the trachea observed on 10 dpi (2.7±0.4% of antibody-stained areas) as well as in the spleen on 5 dpi (3.3±0.2%). There was no NP antigen in other organs. In conclusion, although infection with a LPAIV did not cause obvious clinical disease, viral replication was seen in the trachea and spleen and both local and systemic cellular and humoral immune responses were elicited in these LPAIV-infected chickens.

Keywords: avian influenza, low pathogenic avian influenza virus, cellular immunity, humoral immunity, viral antigen, wild birds

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