Manifestação clínico-patológica de infecção natural pelo Vírus Respiratório Sincicial Bovino (BRSV) em bovinos de criação extensiva no Rio Grande do Sul, Brasil

Pesquisa Veterinária Brasileira

David Driemeier²  Marcos José Pereira Gomes¹  Valéria Moojen¹  Clarice Weiss Arns¹  Guilherme Vogg¹  Luciano Kessler¹  Ubirajara Maciel Da Costa¹ 

[1] ,Universidade Federal do Rio Grande do SulPorto Alegre RS

关键词: BRSV;    bovine;    extensive management;    virology;    serology;    pathology;    Respiratory Complex;    BRSV;    bovinos;    criação extensiva;    virologia;    sorologia;    patologia;    Complexo respiratório;   

DOI  :  10.1590/S0100-736X1997000200006

来源: SciELO

【 摘 要 】

The clinical aspects as well as the pathology, microbiology and serology of a natural Bovine Respiratory Syncytial (BRSV) infection of bovine in a herd of 600 beef cattle kept under extensive management in the State of Rio Grande do Sul, Brazil, are described. Clinically two animals had chronic cough and severe dyspnea when forced to mild physical exercise. These two animals were euthanatized and post-morten examination was performed. The macroscopic changes were of pulmonary origin, such as disseminated alveolar emphysema, focal atelectasis and marked interlobular septal thickening. The fluorescent antibody test on lung cryostat sections was positive to BRSV for both animals, and it was negative to PI-3 virus, BVDV and BHV. The BRSV was isolated from the lung of one of the animals on MDBK, and was also identified by fluorescent antibody test. No association with Chlamydia psittaci was found by ELISA performed on lung tissues.The histopathology showed syncytial cells, chronic emphysema, peribronchiolar muscle layer hypertrophy and squamous metaplasia of bronchial and bronchiolar epithelia. The serology to detect antibodies to BRSV resulted in 79% of positives from the first specimen collection. In this group of young animals some of them had a cough. The second samples collected 6 months later were from animals of different age groups resulting in 17.3% of positives. This is the first report on clinical BRSV infection in Brazil.

【 授权许可】

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