Characterization of bovine respiratory syncytial virus isolated in Brazil

• Published in: Brazilian journal of medical and biological research 2003-02, Vol.36 (2), p.213-218
• Main Authors: Arns, C W, Campalans, J, Costa, S C B, Domingues, H G, D'Arce, R C F, Almeida, R S, Coswig, L T
• Format: Article
• Language: English
• Subjects: Animals; BIOLOGY; Bovine respiratory syncytial virus; Brazil; BRSV; Cattle; Cells, Cultured; Characterization; MEDICINE, RESEARCH & EXPERIMENTAL; Microscopy, Electron; Nested RT-PCR; Respiratory Syncytial Viruses - genetics; Respiratory Syncytial Viruses - isolation & purification; Respiratory Syncytial Viruses - ultrastructure; Reverse Transcriptase Polymerase Chain Reaction; RNA, Viral - analysis; Virus isolation
• ISSN: 0100-879X; 1414-431X; 0100-879X; 1414-431X
• DOI: 10.1590/S0100-879X2003000200008

This paper presents the first isolation of bovine respiratory syncytial virus in Brazil and its physicochemical, morphological and molecular characterization. The virus was isolated from 33 samples of nasotracheal secretions, successively inoculated into a Madin-Darby bovine kidney cell culture, which was characterized by physicochemical tests and morphological observation by electron microscopy. The Brazilian sample is an RNA pleomorphic, enveloped, thermolabile and non-hemagglutinating spicular virus. Reverse transcription, followed by nested polymerase chain reaction (nRT-PCR) assay was carried out using oligonucleotides B1, B2A, B3 and B4 for the fusion proteins (F) and B5A, B6A, B7A and B8 for the attachment protein (G). The nRT-PCR-F amplified a fragment of 481 bp corresponding to part of the gene that codes for protein F, whereas nRT-PCR-G amplified a fragment of 371 bp, in agreement with part of the G gene. The virus isolated from Brazilian samples in this study corresponded to the bovine respiratory syncytial virus, and RT-PCR proved to be useful for the diagnosis of bovine clinical samples.