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Listeria monocytogenes colonization in a newly established dairy processing facility
Beatriz Melero1, Beatrix Stessl2, Beatriz Manso1
1Department of Biotechnology and Food Science, University of Burgos, Burgos, Spain.
International Journal of Food Microbiology
|September 11, 2018
Summary
Listeria monocytogenes contamination was tracked in a new dairy plant for a year. Critical hygiene gaps and personnel movement facilitated its spread, particularly in the new facility.
Area of Science:
- Food Microbiology
- Dairy Science
- Food Safety
Background:
- Listeria monocytogenes is a significant foodborne pathogen.
- Dairy processing plants require rigorous monitoring for contamination.
- Understanding pathogen dynamics is crucial for effective control strategies.
Purpose of the Study:
- To investigate the prevalence and colonization patterns of Listeria monocytogenes in a new dairy processing plant over one year.
- To identify critical control points and factors contributing to L. monocytogenes spread within the facility.
- To provide insights for improving food safety in dairy operations.
Main Methods:
- Environmental and food sampling across two buildings representing different production stages.
- Molecular subtyping of L. monocytogenes isolates using Pulse Field Gel Electrophoresis (PFGE) and Multilocus Sequence Typing (MLST).
- Analysis of quality control measures via a questionnaire.
Main Results:
- Overall prevalence of L. monocytogenes was 8.40%.
- The salting area in the older building showed the highest positive sample proportion and PFGE type diversity.
- A specific L. monocytogenes strain (PFGE type 3, ST-204) spread throughout the new facility after its initial detection.
Conclusions:
- Inadequate hygienic barriers and uncontrolled personnel flow were identified as key factors in L. monocytogenes dissemination.
- Knowledge of colonization patterns aids in designing safer dairy facilities and enhancing current food safety practices.
- Proactive monitoring and targeted interventions are essential for controlling L. monocytogenes in dairy environments.
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