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Characterizing Salmonella Contamination in Two Rendering Processing Plants.

Chao Gong1, Xiuping Jiang2

  • 1Department of Biological Sciences, Clemson University, Clemson, South Carolina 29634, USA.

Journal of Food Protection
|February 22, 2017
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Summary

Salmonella contamination in rendering plants originates from raw materials. Biofilms in processing areas can recontaminate finished products, indicating cross-contamination risks.

Keywords:
BiofilmCross-contaminationRendering processing environmentSalmonella

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Area of Science:

  • Food safety microbiology
  • Industrial microbiology

Background:

  • Rendering plants process animal by-products, creating potential niches for microbial contamination.
  • Salmonella poses a significant foodborne pathogen risk, necessitating control in food production environments.

Purpose of the Study:

  • To investigate Salmonella contamination and cross-contamination pathways within U.S. rendering plants.
  • To identify primary sources and environmental reservoirs of Salmonella in rendering facilities.

Main Methods:

  • Microbiological analysis of samples from raw material receiving, crax grinding, and finished meal loading areas.
  • Salmonella enumeration, enrichment, and confirmation using selective agars and broths.
  • Isolate characterization via pulsed-field gel electrophoresis, serotyping, and biofilm formation assays.

Main Results:

  • 73% of samples tested positive for Salmonella after enrichment.
  • 31 unique Salmonella pulsed-field gel electrophoresis patterns and 16 serotypes were identified.
  • Raw materials receiving areas were identified as the primary Salmonella source; biofilms were found in processing areas.

Conclusions:

  • The raw materials receiving area is a significant source of Salmonella contamination.
  • Biofilms in crax grinding and finished meal loading areas contribute to Salmonella persistence and potential recontamination.
  • Identical Salmonella serotypes in different areas suggest cross-contamination throughout the rendering process.