Pathogenic and immunosuppressive effects of avian pneumovirus in turkeys

Avian Diseases
Parag CharyJ M Sharma

Abstract

Avian pneumovirus (APV) causes a respiratory disease in turkeys. The virus has been associated with morbidity and mortality due to secondary infections. Our objective was to determine if APV caused immunosuppression in the T-cell or B-cell compartments and to study the pathogenesis of the disease in APV maternal antibody-lacking 2-wk-old commercial turkeys. APV was administered by the eyedrop/intranasal route. Observations were made for gross lesions, viral genome, and T-cell mitogenesis and cytokine secretion at 3, 5, 7, 14, and 21 days postinoculation (DPI). During the acute phase of the disease that lasted for about 1 wk, the turkeys exposed to APV showed clinical signs characterized by nasal discharge and sinus swelling. Virus genome was detected by in situ hybridization in cells of turbinates and trachea at 3 and 5 DPI. At 3 and 5 DPI, spleen cells of the birds infected with APV markedly decreased proliferative response to concanavalin A (Con A). Con A and lipopolysaccharide stimulation of spleen cells from virus-exposed turkeys resulted in accumulation of nitric oxide-inducing factors (NOIF) in the culture fluid. NOIF were not detected in culture fluids of Con A-stimulated spleen cells of virus-free turkeys. APV did not c...Continue Reading

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Citations

Nov 26, 2009·Avian Pathology : Journal of the W.V.P.A·Dennis Rubbenstroth, Silke Rautenschlein
Apr 1, 2003·Animal Health Research Reviews·Humphrey C M LwambaM Kariuki Njenga
Dec 25, 2010·Veterinary Immunology and Immunopathology·Silke RautenschleinChristine Haase
Dec 15, 2010·Veterinary Immunology and Immunopathology·Ra Mi ChaJagdev M Sharma
Jan 2, 2010·Developmental and Comparative Immunology·Dennis RubbenstrothSilke Rautenschlein
Jan 9, 2007·Veterinary Immunology and Immunopathology·Martin Liman, Silke Rautenschlein
Jan 19, 2007·Vaccine·Binu T VelayudhanKakambi V Nagaraja
Aug 23, 2005·Veterinary Immunology and Immunopathology·Parag CharyJagdev M Sharma

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Methods Mentioned

BETA
enzyme-linked immunosorbent assay
ELISA
light microscopy

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