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Detection of Enterohemorrhagic Escherichia Coli Colonization in Murine Host by Non-invasive In Vivo Bioluminescence System
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Multi-Exposure Pathway Model to Compare Escherichia coli O157 Risks and Interventions.

B Chapman1,2, K Pintar1, B A Smith1

  • 1Public Health Agency of Canada, Guelph, ON, Canada.

Risk Analysis : an Official Publication of the Society for Risk Analysis
|May 5, 2017
PubMed
Summary
This summary is machine-generated.

Direct cattle contact poses the highest risk per exposure to E. coli O157:H7. However, frequent consumption of contaminated ground beef presents the greatest overall public health risk from cattle farms.

Keywords:
CattleE. coli O157:H7QMRArelative risksimulationstochastic

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Area of Science:

  • Food safety
  • Microbial risk assessment
  • Environmental health

Background:

  • Cattle-manure-borne Escherichia coli O157:H7 poses public health risks.
  • Exposure pathways require further characterization.
  • Quantitative microbial risk assessment (QMRA) models can assess these risks.

Purpose of the Study:

  • To compare the relative importance of five exposure routes for E. coli O157:H7 from cattle farms.
  • To evaluate the efficacy of hypothetical interventions.
  • To inform public health strategies for risk reduction.

Main Methods:

  • Developed a stochastic QMRA model for a hypothetical cattle farm.
  • Integrated existing QMRA models with climate and field-level submodels.
  • Assessed five exposure pathways: aquatic recreation, ground beef, leafy greens, direct animal contact, and pasture recreation.

Main Results:

  • Direct animal contact showed the highest risk per exposure during peak pathogen shedding.
  • Consumption of ground beef posed the greatest overall illness risk when exposure frequency was considered.
  • Evaluated the combined effects of preharvest and downstream interventions.

Conclusions:

  • Ground beef consumption represents a significant public health risk associated with cattle farming.
  • Intervention strategies targeting multiple pathways are crucial for risk mitigation.
  • Further research incorporating environmental and behavioral variability is needed for population-level risk assessment.