Data obtained in this study highlighted the importance of egg refrigeration in terms of improving product safety.Įgg associated human salmonellosis is a significant economic burden on global public health systems 1, 2, 3. Mice fed with inoculated egg yolk, albumen, or eggshell wash stored at refrigerated temperature did not show signs of salmonellosis during the period of the experiment. The gene expression study showed that ompR, misL, pefA, spvA, shdA, bapA, and csgB were significantly up-regulated in the egg yolk stored at 5 ☌ and 25 ☌ for 96 h however, an in-vivo study revealed that mice infected with egg yolk stored at 25 ☌, developed salmonellosis from day 3 post-infection (p.i.). The in-vitro egg study showed that the load of Salmonella Typhimurium significantly increased in yolk and albumen stored at 25 ☌. In the current study, in-vitro and in-vivo experiments were conducted to understand the role of egg storage temperatures (refrigerated vs ambient) on bacterial load and the virulence genes expression of Salmonella Typhimurium. Except for the United States, the guidelines on egg refrigeration are not prescriptive. In Australia, it is recommended that eggs should be refrigerated to prevent condensation that can enhance bacterial penetration across the eggshell. Salmonella Typhimurium is a human pathogen associated with eggs and egg-derived products.

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