Comparative physical and genetic maps of the virulence plasmids of Salmonella enterica serovars Typhimurium, Enteritidis, Choleraesuis, and Dublin

Using fragment profiling, PCR, and Southern hybridization, we found that Sa lmonella enterica serovar Choleraesuis harbored virulence plasmids of vario us sizes, whereas serovars Typhimurium, Enteritidis, and Dublin carried a p lasmid of a unique size. Also, the virulence plasmid of Typhimurium contain ed genes in the same order detected in the other three plasmids, all of whi ch contained deletions.