Abstract
Pasteurella haemolytica serotype A1 isolates were collected from cattle within a feedlot during an outbreak of bovine respiratory disease. Genetic heterogeneity among the isolates was examined by restriction endonuclease analysis (REA), ribotyping, and analysis of plasmid content. The susceptibilities of isolates to several antibiotics were also examined. Five different REA patterns and three different ribotypes were observed among the isolates. Fifty percent of the isolates had an identical REA type, ribotype, and plasmid profile. Examination of the plasmid content of the isolates revealed that most (73%) carry a single plasmid which encodes beta-lactamase, 13.5% carry two plasmids, and 13.5% carry no plasmid. The data reveal the presence of genetic differences among isolates of P. haemolytica A1, associated with shipping fever pneumonia within a closed feedlot, and suggest that a combination of REA, ribotyping, plasmid analysis, and antibiotic susceptibility determination will be useful in analyzing the molecular epidemiology of this disease.
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