PESQUISA VETERINÁRIA BRASILEIRA

Abstract in English:

ABSTRACT.- Headley S.A., Sousa I.K.F., Minervino A.H.H., Barros I.O., Barrêto Júnior R.A., Alfieri A.F., Ortolani E.L. & Alfieri A.A. 2012. Molecular confirmation of ovine herpesvirus 2-induced malignant catarrhal fever lesions in cattle from Rio Grande do Norte, Brazil. Pesquisa Veterinária Brasileira 32(12):1213-1218. Laboratório de Patologia Veterinária, Faculdade de Medicina Veterinária, Universidade Norte do Paraná, PR 218 Km 1, Cx. Postal 560, Arapongas, PR 86702-670, Brazil. E-mail: headleysa@gmail.com Molecular findings that confirmed the participation of ovine herpesvirus 2 (OHV-2) in the lesions that were consistent with those observed in malignant catarrhal fever of cattle are described. Three mixed-breed cattle from Rio Grande do Norte state demonstrated clinical manifestations that included mucopurulent nasal discharge, corneal opacity and motor incoordination. Routine necropsy examination demonstrated ulcerations and hemorrhage of the oral cavity, corneal opacity, and lymph node enlargement. Significant histopathological findings included widespread necrotizing vasculitis, non-suppurative meningoencephalitis, lymphocytic interstitial nephritis and hepatitis, and thrombosis. PCR assay performed on DNA extracted from kidney and mesenteric lymph node of one animal amplified a product of 423 base pairs corresponding to a target sequence within the ovine herpesvirus 2 (OHV-2) tegument protein gene. Direct sequencing of the PCR products, from extracted DNA of the kidney and mesenteric lymph node of one cow, amplified the partial nucleotide sequences (423 base pairs) of OHV-2 tegument protein gene. Blast analysis confirmed that these sequences have 98-100% identity with similar OHV-2 sequences deposited in GenBank. Phylogenetic analyses, based on the deduced amino acid sequences, demonstrated that the strain of OHV-2 circulating in ruminants from the Brazilian states of Rio Grande do Norte and Minas Gerais are similar to that identified in other geographical locations. These findings confirmed the active participation of OHV-2 in the classical manifestations of sheep associated malignant catarrhal fever.

• Ovine herpesvirus 2 malignant catarrhal fever gammaherpesvirus herpesvírus ovino tipo 2 febre catarral malígna

Abstract in Portuguese:

RESUMO.- Headley S.A., Sousa I.K.F., Minervino A.H.H., Barros I.O., Barrêto Júnior R.A., Alfieri A.F., Ortolani E.L. & Alfieri A.A. 2012. Molecular confirmation of ovine herpesvirus 2-induced malignant catarrhal fever lesions in cattle from Rio Grande do Norte, Brazil. [Diagnóstico molecular de herpesvírus ovino tipo 2 em surto de febre catarral malígna em bovinos do Rio Grande do Norte.] Pesquisa Veterinária Brasileira 32(12):1213-1218. Laboratório de Patologia Veterinária, Faculdade de Medicina Veterinária, Universidade Norte do Paraná, PR 218 Km 1, Cx. Postal 560, Arapongas, PR 86702-670, Brazil. E-mail: headleysa@gmail.com Os achados moleculares confirmaram a participação do herpesvírus ovino tipo 2 (OHV-2) nas lesões observadas em um surto de febre catarral malígna em bovinos. Três bovinos oriundos de propriedade rural de Mossoró, Rio Grande do Norte apresentaram manifestações clínicas, que incluíram secreção nasal mucopurulenta, opacidade da córnea e incoordenação motora. A necropsia revelou ulcerações e hemorragias da cavidade oral, opacidade da córnea e linfonodomegalia. Os achados histopatológicos significativos incluíam vasculite necrosante generalizada, meningoencefalite não supurativa, nefrite intersticial linfocítica, hepatite linfocítica e trombose. A PCR, realizada a partir de DNA extraído do rim e do linfonodo mesentérico de um dos animais, amplificou um produto com 423 pares de base do gene da proteína do tegumento do herpesvírus ovino 2 (OHV-2). O sequenciamento direto dos produtos da PCR e a análise pelo Blast demonstraram que o produto amplificado apresentava 98-100% de identidade com sequências do OHV-2 depositadas no GenBank. As análises filogenéticas, baseadas nas sequências deduzidas de aminoácidos demonstraram que a cepa de OHV-2 circulando em ruminantes nos estados de Rio Grande do Norte e Minas Gerais são semelhantes àquelas identificadas em outras regiões geográficas. Esses achados confirmam a participação ativa de OHV-2 nas manifestações clássicas de febre catarral maligna em ovinos.

Abstract in English:

ABSTRACT.- Costa E.A., Bastianetto E., Vasconcelos A.C., Bomfim M.R.Q., Fonseca F.G., Gomes A.D., Leite R.C. & Resende M. 2009. An outbreak of malignant catarrhal fever in Murrah buffaloes in Minas Gerais, Brazil. Pesquisa Veterinária Brasileira 29(5):395-400. Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte, MG 31270-901, Brazil. E-mail: lvc@icb.ufmg.br An outbreak of Malignant Catarrhal Fever (MCF) resulted in death of five female buffaloes and one domestic cow from the same farm. Four buffaloes died 10-15 days after the appearance of clinical signs, while the fifth was euthanized in extremis, after similar clinical signs. Histopathological lesions included multifocal histiolymphocytic epicarditis, myocarditis and lymphocytic interstitial pneumonia, which are commonly seen in cases of MCF in buffaloes. Furthermore, lymphocytic vasculitis centered in the adventitia, with occasional fibrinoid necrosis in the muscular layer, was found in the kidneys, liver, spleen, lymph nodes and brain. Nucleotide sequencing of DNA fragments from the central nervous system amplified by PCR revealed 98% similarity with known OHV-2 sequences from Genbank. Additionally, PCR analysis also revealed the presence of OHV-2 DNA in the peripheral mononuclear blood cells of two clinically healthy buffaloes. The diagnosis of MCF was based on epidemiological, clinical, gross and histopathological findings and on the results of a semi-nested PCR followed by nucleotide sequencing.

• Diseases of buffaloes doenças de búfalos gammaherpesviruses gammaherpesvirus malignant catarrhal fever

Abstract in Portuguese:

ABSTRACT.- Costa E.A., Bastianetto E., Vasconcelos A.C., Bomfim M.R.Q., Fonseca F.G., Gomes A.D., Leite R.C. & Resende M. 2009. An outbreak of malignant catarrhal fever in Murrah buffaloes in Minas Gerais, Brazil. Pesquisa Veterinária Brasileira 29(5):395-400. Departamento de Microbiologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Belo Horizonte, MG 31270-901, Brazil. E-mail: lvc@icb.ufmg.br An outbreak of Malignant Catarrhal Fever (MCF) resulted in death of five female buffaloes and one domestic cow from the same farm. Four buffaloes died 10-15 days after the appearance of clinical signs, while the fifth was euthanized in extremis, after similar clinical signs. Histopathological lesions included multifocal histiolymphocytic epicarditis, myocarditis and lymphocytic interstitial pneumonia, which are commonly seen in cases of MCF in buffaloes. Furthermore, lymphocytic vasculitis centered in the adventitia, with occasional fibrinoid necrosis in the muscular layer, was found in the kidneys, liver, spleen, lymph nodes and brain. Nucleotide sequencing of DNA fragments from the central nervous system amplified by PCR revealed 98% similarity with known OHV-2 sequences from Genbank. Additionally, PCR analysis also revealed the presence of OHV-2 DNA in the peripheral mononuclear blood cells of two clinically healthy buffaloes. The diagnosis of MCF was based on epidemiological, clinical, gross and histopathological findings and on the results of a semi-nested PCR followed by nucleotide sequencing.