Abstract
Sixteen six to eight month old beef calves were exposed individually to a five minute aerosol of bovine herpesvirus 1, isolate 108. Aerosol exposure to Pasteurella haemolytica (biotype A, serotype 1) was administered individually for five minutes at either four, ten, 20 or 30 days after the virus. Fibrinous pneumonia and pleuritis occurred in all four groups but were most extensive and severe in those exposed to the virus and bacterium four days apart (the positive controls). Fibrinous pneumonia was associated with persistence of bovine herpesvirus 1 in the respiratory tract despite resolution of virus-induced necrotic lesions of the respiratory mucosa. The results presented here suggest that, although the severity of viral-bacterial synergism may be influenced by virus-induced morphological changes, the continued presence of viral antigens after the resolution of respiratory mucosal lesions may continue to exert some effect on host defenses and disease processes.
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