Genetic Study of Multi-Drug Resistant Salmonella Heidelberg in Canada
Author Information
Author(s): Andrysiak Ashleigh K, Olson Adam B, Tracz Dobryan M, Dore Kathryn, Irwin Rebecca, Ng Lai-King, Gilmour Matthew W
Primary Institution: Public Health Agency of Canada
Hypothesis
Is there a genetic link between multi-drug resistant Salmonella Heidelberg isolates from agri-food sources and human clinical samples?
Conclusion
The study found limited genetic diversity among Salmonella Heidelberg isolates, making it difficult to identify traits for tracking sources of infection.
Supporting Evidence
- 61% of isolates were indistinguishable by PFGE.
- 15% of isolates had closely related PFGE patterns.
- Genetic variation was attributed to plasmid content affecting antimicrobial susceptibility.
- All ESC resistant isolates were PCR positive for the blacmy-2 gene.
Takeaway
Scientists looked at germs from sick people and chickens to see if they were the same, but they found that the germs were too similar to tell where they came from.
Methodology
The study used pulsed-field gel electrophoresis, DNA sequence-based typing, and comparative genomic hybridization to analyze the genetic relationships of Salmonella Heidelberg isolates.
Limitations
The limited genetic diversity among isolates hindered the identification of variable traits for source tracking.
Participant Demographics
Isolates were obtained from human clinical, retail, and agri-food animal sources.
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website