Adaptação e comparação das tecnicas de RT-nested-PCR e imuno-histoquimica no diagnostico do virus respiratorio sincicial bovino (BRSV)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2004

RESUMO

Bovine respiratory syncytial virus (BRSV) is the etiologic agent of widely distributed respiratory infections and is responsible for significant economic losses in commercial cattle production. Infection by BRSV produces pathological changes such as bronchiolitis and interstitial pneumonia and affects mainly young animals. The poor growth of the virus in cell cultures and its instability represent difficulties in virus isolation from clinical samples. The aim of the present work was to standardise fast, sensitive and specific methods to detect BRSV, using a Brazilian strain. For this purpose, Balb/c mice were used as experimental model to the BRSV infection, from which the virus was detected by the RT-nested-PCR and immunohistochemistry (IHC) standardised, and the results were compared with experimentally infected calves. RT-nested-PCR was more sensitive in detecting BRSV than IHC, from both mouse and calf tissues. These techniques were also used to screen calves suspected of being infected with BRSV. One of the suspected samples was positive by RTnested- PCR and IHC. Sequencing of the PCR products of this sample was carried out. This new isolate and the previously described BRSV-25-BR strain (the only well-known isolate in Brazil) are belong to subgrupo B and provide an important tool to evaluate the profile and to esteem the origin of Brazilian BRSV isolates and to determine the local necessities about the vaccines content. The standardised RT-nested-PCR and IHC techniques could be useful in the epidemiological studies and laboratory diagnosis of BRSV in Brazil.

ASSUNTO(S)

imunohistoquimica biologia molecular reação em cadeia de polimerase virologia

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