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Use of bacteriophages as sanitizing agents has received much attention. However, safety in humans is debatable. To determine inflammatory immune responses against bacteriophages, rats were treated with a 8 log plaque-forming cocktail of 5 bacteriophages for pathogenic Escherichia coli per day for 4 weeks. Food consumption, feeding efficiency, and body weight of rats treated with the cocktail were not different from controls. Phages were not detected in the sera of phage-fed rats with no changes in organ weights. Notable changes were not observed upon histopathological examination of the liver, kidney, and spleen. Pro-inflammatory cytokine mRNA expression, except COX-2 (2.4x increase), remained unaffected after treatment with the phage cocktail. No remarkable changes were observed for levels of 12 pro-inflammatory cytokines in sera. Inflammatory responses in rats orally treated with a phage cocktail were not observed. Bacteriophages for E. coli are indicated as immunologically safe in rats.

Safety of using Escherichia coli bacteriophages as a sanitizing agent based on inflammatory responses in rats