Abstract
Five conventionally kept calves aged between 17 and 24 days were experimentally infected with bovine respiratory syncytial virus (BRSV) by aerosol in order to mimic the natural infection route. The calves were killed and autopsies performed 7 days after the first virus challenge. The BRSV isolate used induced tracheitis, bronchitis and atelectasis in infected calves. The only virus which could be isolated from the lungs of the calves was BRSV. In addition, Mycoplasma bovirhinis was isolated from the lung or/and trachea of two calves. The clinical and histopathological findings, as well as the detection of BRSV antigens by immunofluorescence in the epithelial cells of lung and trachea, and the reisolation of the virus from bronchoalveolar lavage fluids of all inoculated calves, provided confirmation of successful infection with BRSV.
Keywords: Respiratory syncytial virus, calf, aerosol exposure
Résumé
Afin de stimuler une infection naturelle, 5 veaux conventionnels, âgés de 17 à 24 jours, furent l'objet d'une infection expérimentale réalisée à l'aide d'aérosols contenant le virus respiratoire syncytial bovin (BRSV). Les veaux furent euthanasiés et autopsiés 7 jours après la première exposition au virus. Les isolats de BRSV utilisés provoquèrent, chez les veaux infectés, une trachéite, une bronchite et de l'atelectasie. Le seul virus pouvant être isolé des poumons fut le BRSV. Mycoplasma bovirhinis fut également isolé des poumons et/ou de la trachée de deux veaux. Les constatations cliniques et histopathologiques, la détection (par immunofluorescence) des antigènes BRSV dans les cellules épithéliales du poumon et de la trachée, et l'isolement du virus dans le liquide issu des lavages broncho-alvéolaires confirmèrent le succès de cette infection par BRSV.
Mots-clé: Virus respiratoire syncytial, veau, aérosol exposition
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