Effect of organic acids and quaternary ammonium compounds on survival of Salmonella serovars with SGI1- mediated multi-antibiotic resistance
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In this study, the fate of six multidrug resistant (MDR) and two non-MDR Salmonella were evaluated when exposed to organic acids and quaternary ammonium compounds. Acid adapted bacteria survived better than non-adapted bacteria when challenged with 2% of acetic or lactic acids at pH 3.5. Adjustment with organic acids did not confer cross-protection against further treatments with quaternary ammonium compounds. There was no significant difference (p>0.05) in survival between MDR and non-MDR Salmonella to organic acid-cross protection against quaternary ammonium treatments and to resistance in biofilms; however, there was a significant difference (p<0.05) in survival between MDR and non-MDR Salmonella after exposure to quaternary ammonium compounds and organic acid treatments.