Growth and Heat Resistance of Salmonella enteritidisin Refrigerated and Abused Eggs

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Abstract
The effect of storage temperature on the growth and heat resistance of Salmonella enteritidis (SE) in eggs artificially inoculated with 20 CFU per egg has been investigated. SE organisms grew to a stationary phase (1 × 109 CFU/ml of egg) within 2–3 d after storing the eggs at room temperature (23°C), while minimal or no growth occurred in similarly inoculated eggs that were refrigerated at 4°C. None of the common methods of egg cooking was found totally effective in eliminating SE organisms in massively contaminated eggs. SE organisms survived in significantly higher proportions of the eggs that were stored at 23°C than in refrigerated eggs after cooking by different methods (P < 0.05). Higher rates of Salmonella survival after cooking were detected in the eggs that were stored at room temperature for 5 d or longer than in eggs stored for shorter time (P < 0.05). Data from this study indicated: i) storage abuse of eggs can be a major factor in increasing the prevalence of eggborne SE infections by increas...

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