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Updated: Feb 8, 2026

Detection of Foodborne Bacterial Pathogens from Individual Filth Flies
Published on: February 13, 2015
GenomeTrakr proficiency testing for foodborne pathogen surveillance: an exercise from 2015.
Ruth E Timme1, Hugh Rand1, Maria Sanchez Leon1
1Center for Food Safety and Applied Nutrition, US Food and Drug Administration, College Park, MD, USA.
Whole-genome sequencing (WGS) in food safety is reliable for pathogen surveillance. A proficiency test showed high reproducibility and data quality across multiple labs, ensuring accurate public health decisions.
Area of Science:
- Food safety
- Microbiology
- Genomics
- Public health
Background:
- Whole-genome sequencing (WGS) is increasingly vital for global food safety and public health surveillance.
- The GenomeTrakr network utilizes WGS data for real-time foodborne pathogen surveillance.
- Ensuring data quality and analytical validity is crucial for WGS-driven enforcement decisions.
Purpose of the Study:
- To assess the reproducibility and data quality of whole-genome sequencing (WGS) for foodborne pathogen surveillance.
- To validate the GenomeTrakr cluster analysis pipeline using proficiency testing data.
Main Methods:
- Eight common foodborne pathogen isolates were distributed to participating laboratories for WGS.
- Laboratories followed a standardized WGS protocol using Illumina MiSeq.
- Sequence data were evaluated for labeling accuracy, quality, and single nucleotide polymorphism (SNP) identification.
Main Results:
- High reproducibility was observed in Illumina MiSeq sequence data across 21 laboratories.
- A narrow range of technical and biological variance was detected.
- SNP data confirmed the robustness of the cluster analysis pipeline, enabling clear identification of isolates from the same source.
Conclusions:
- Proficiency testing demonstrates the reliability and reproducibility of WGS for foodborne pathogen surveillance.
- The GenomeTrakr network's data and analysis pipeline are robust, supporting accurate public health decisions.
- Standardized WGS protocols and routine testing ensure the validity of data used in food safety enforcement.
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