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2003, Number 1

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Vet Mex 2003; 34 (1)

Viral participation in respiratory disease in feedlot cattle, as identified by immunohistochemistry

Juárez BF, Trigo TFJ, Chávez GG, Vargas GRE

Language: English/Spanish
References: 34
Page: 1-12
PDF size: 113.91 Kb.


ABSTRACT

Bovine respiratory disease in feedlot cattle is an important cause of economic loss. Among the possible agents, one can mention: infectious bovine respiratory virus (IBR), parainfluenza 3 virus (PI3) and bovine respiratory syncytial virus (BRSV). These respiratory diseases have been widely studied in different countries, however, in Mexico, there is limited information on the participation of these agents in bovine pneumonias. The objective of this study was to determine the participation of these agents of bovine pneumonias in feedlot conditions. Forty-eight pneumonic samples were collected for pathologic and immunohistochemical studies from a feedlot farm located in Culiacan, in the state of Sinaloa, in Mexico. Exudative pneumonias represented 87.5% while 12.5% were lymphoproliferative. Immunohistochemistry applied to 24 lungs and 12 tracheas revealed 66.6% of the lungs positive to PI3 virus, 54.1% positive to BRSV and 33.3% of the tracheas positive to IBR virus. The pathological features of the pneumonias corresponded to previous reports. Immunohistochemistry was revealed to be an efficient technique in the identification of viral antigens. It is concluded that viral agents are commonly involved in bovine pneumonias, and that exudative inflammation is the most common pneumonic presentation.


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