Filipe Santos Fernando
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
Maria de Fatima da Silva Montassier
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
Ketherson Rodrigues Silva
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
Cintia Hiromi Okino
Embrapa Swine and Poultry, Concordia 89700-000, SC, Brazil
Elisabete Schirato de Oliveira
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
Camila Cesario Fernandes
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
Marcio de Barros Bandarra
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Pathology, Jaboticabal 14884-900, SP, Brazil
Mariana Costa Mello Goncalves
Federal Institute of Goias - Rio Verde 75901-970, GO, Brazil
Mariana Monezi Borzi
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
Romeu Moreira dos Santos
School of Agricultural and Veterinary Sciences, S�o Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
Rosemeri de Oliveira Vasconcelos
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Pathology, Jaboticabal 14884-900, SP, Brazil
Antonio Carlos Alessi
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Pathology, Jaboticabal 14884-900, SP, Brazil
Helio Jose Montassier
School of Agricultural and Veterinary Sciences, Sao Paulo State University (FCAV-Unesp), Department of Veterinary Pathology, Laboratory of Veterinary Immunology and Virology, Jaboticabal 14884-900, SP, Brazil
ABSTRACT
Infectious bronchitis virus (IBV) induces a significant negative impact on poultry production worldwide, specially due to the continuous emergence of viral variants. This virus causes damage to the respiratory tract, and depending on the virus strain, affects and damages the urogenital system. The objective of this study is to characterize the pathotype and the cross-immunity with regard to Massachusetts vaccine strain (H120) of a Brazilian IBV field isolate (IBVPR-05) previously S1 genotyped as a variant. The pathogenicity test was conducted on two experimental groups of specific pathogen free chickens; one was vaccinated with attenuated Massachusetts H120 strain and the other remained non-vaccinated. Three weeks after vaccination, both groups were challenged with IBRPR-05. The tracheal ciliostasis, and the viral load, histopathology and immunohistochemistry in trachea and kidney samples were evaluated. The viral loads, measured by quantitative real time RT-PCR, were higher in kidney than in trachea, and the most prominent histopathological changes were found in the kidneys. The renal lesions were characterized by the presence of nephritis with intense inflammation, tubular epithelial cell degeneration and necrosis. The H120 vaccine induced a partial protection against the infection of trachea and kidney tissues by this variant isolate. Thus, the Brazilian variant isolate IBVPR-05 was characterized in this study as a nephropathogenic pathotype and as a protectotype differing from Massachusetts vaccine strain of IBV. This indicates the importance to determine these biologic characteristics of other Brazilian variant IBV isolates, in order to implement more effective control measures of IBV infection in this country.
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Filipe Santos Fernando, Maria de Fatima da Silva Montassier, Ketherson Rodrigues Silva, Cintia Hiromi Okino, Elisabete Schirato de Oliveira, Camila Cesario Fernandes, Marcio de Barros Bandarra, Mariana Costa Mello Goncalves, Mariana Monezi Borzi, Romeu Moreira dos Santos, Rosemeri de Oliveira Vasconcelos, Antonio Carlos Alessi and Helio Jose Montassier, 2013. Nephritis Associated with a S1 Variant Brazilian Isolate of Infectious Bronchitis Virus and Vaccine Protection Test in Experimentally Infected Chickens. International Journal of Poultry Science, 12: 639-646.
DOI: 10.3923/ijps.2013.639.646
URL: https://scialert.net/abstract/?doi=ijps.2013.639.646
DOI: 10.3923/ijps.2013.639.646
URL: https://scialert.net/abstract/?doi=ijps.2013.639.646
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