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Pathogen prevalence and microbial levels associated with restricted shell eggs.

D R Jones1, M T Musgrove

  • 1U.S. Department of Agriculture, Agricultural Research Service, Egg Safety and Quality Research Unit, Athens, Georgia 30605, USA. deana.jones@ars.usda.gov

Journal of Food Protection
|September 29, 2007
PubMed
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Microbiological analysis of restricted shell eggs revealed significant Enterobacteriaceae on shells and prevalence of Listeria. This highlights the need to reassess pasteurization guidelines for broader pathogen effectiveness.

Area of Science:

  • Food Microbiology
  • Food Safety
  • Microbial Ecology of Shell Eggs

Background:

  • Restricted shell eggs, unsuitable for retail, are diverted for further processing.
  • Characterizing microbial populations in these eggs is crucial for food safety.
  • Existing pasteurization guidelines may need reevaluation.

Purpose of the Study:

  • To determine the microbiological profiles of restricted shell eggs.
  • To assess the prevalence of specific bacterial pathogens (Salmonella, Campylobacter, Listeria).
  • To inform the adequacy of current pasteurization protocols.

Main Methods:

  • Collection of restricted eggs from three processing plants over three replicates.
  • Pooling of shells and contents for microbiological analysis.

Related Experiment Videos

  • Enumeration of total aerobic microorganisms and Enterobacteriaceae; detection of Salmonella, Campylobacter, and Listeria via cultural methods.

    • Main Results:

    • Average aerobic counts were 4.3 log CFU/ml for shells and 2.0 log CFU/ml for contents.
    • Enterobacteriaceae prevalence was 36.7% on shells (2.4 log CFU/ml) versus <0.1 log CFU/ml in contents.
    • Pathogen prevalence: 0.5% Campylobacter positive (shell), 1.1% Salmonella positive (shell), and 21% Listeria positive (33 shells, 5 contents).

    Conclusions:

    • Significant microbial load, including pathogens, found on restricted shell eggs.
    • Listeria prevalence indicates potential limitations of current pasteurization focused on Salmonella.
    • Revisiting and potentially revising pasteurization guidelines is recommended for comprehensive pathogen control.