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acute bovine viral diarrhea associated with extensive mucosal lesions, high morbidity, and mortality in a commercial feedlot.in 2008, a northwest texas feedlot underwent an outbreak of bovine viral diarrhea virus (bvdv) causing high morbidity and mortality involving 2 lots of calves (lots a and b). severe mucosal surface lesions were observed grossly in the oral cavity, larynx, and esophagus. mucosal lesions varied from small (1-3 mm) infrequent mucosal ulcerations to large (5 mm to 1 cm) and coalescing ulcerations. necrotic debris was present in ulcerations of some mortalities with some having plaque-like debris, but ...201222379057
change in predominance of bovine viral diarrhea virus subgenotypes among samples submitted to a diagnostic laboratory over a 20-year time span.although the causative agent of bovine viral diarrhea was initially categorized as 1 species, phylogenetic analysis revealed that these viruses belong to 2 different species, bovine viral diarrhea virus 1 (bvdv-1) and bvdv-2, with 2-11 subgenotypes within each species. distribution of species and subgenotypes has been shown to vary with geographic region. whether distribution shifts over time is not known. surveys conducted between 1994 and 2008 reported 3 subgenotypes circulating among cattle i ...201121398436
pathogens of bovine respiratory disease in north american feedlots conferring multidrug resistance via integrative conjugative elements.in this study, we determined the prevalence of bovine respiratory disease (brd)-associated viral and bacterial pathogens in cattle and characterized the genetic profiles, antimicrobial susceptibilities, and nature of antimicrobial resistance determinants in collected bacteria. nasopharyngeal swab and lung tissue samples from 68 brd mortalities in alberta, canada (n = 42), texas (n = 6), and nebraska (n = 20) were screened using pcr for bovine viral diarrhea virus (bvdv), bovine respiratory syncy ...201424478472
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