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Medicine and Health Sciences


Many Gram negative bacteria including Salmonella enterica species exhibit evolving multi-drug resistance coded for on their chromosome and on mobile genetic elements. Salmonella species carrying multi-drug resistance plasmids can potentially disperse the cmy-2 gene conferring β- lactam resistance to new Salmonella species as well as to other enteric bacteria commonly found in the human and animal gut. Objective: This study seeks to identify the numbers and incompatibility types of plasmids carried by six different Salmonella clinical isolates. Design: Raw whole genome and DNA fragment (contig) sequence secondary data analyses were conducted using the Center for Genomic Epidemiology (Lyngby, Denmark) open source internet databases plasmid Multilocus Sequence Typing (pMLST) and Resistance Finder (ResFinder). Method: Nucleic acid sequences were separated into files, labeled by contig, and uploaded to the consensus databases for analysis against known Salmonella resistance genes and plasmid types. Results were returned in table format and identified specific resistance, susceptibility, and incompatibility groups present with greater than 90% homology between known and analyzed DNA sequences. Results: Results of this analysis show that these bacterial strains carry plasmids which confer multi-drug resistance and that multiple incompatibility groups are present across some but not all analyzed Salmonella strains. Conclusions: The researchers continue to analyze the data and have not yet formed conclusions as to their significance. This study will advance our understanding about how bacteria develop multiple antibiotic resistances and could ultimately help design more effective drugs with greater potential to combat and prevent bacterial diseases.


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