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• W3205488300 endingPage "109443" @default.
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• W3205488300 abstract "The high prevalence of Salmonella enterica in milk poses a risk of considerable concern in the preservation of certain dairy products, mainly those elaborated from raw milk. Essential oils (EOs) have been proposed as a promising food preservative for such products due to their strong antimicrobial properties. Additionally, these natural antimicrobials have been shown to be effective against multi-drug resistant strains. They can thus also be utilized to prevent the dissemination of antimicrobial resistances (AMR). However, recent evidence of the development of bacterial resistance under EO treatments may call their use into question. This study sought to assess the emergence of antimicrobial resistant genetic variants of S. enterica serovar Typhimurium from survivors after cyclic exposure to lethal doses (>5 log10 cycles of inactivation) of Thymbra capitata EO (TCO), in order to evaluate the impact that it could have on milk preservation, to ascertain whether cross-resistance to antibiotics occurs, and to identify the genomic changes responsible for their phenotype. Isolated strains by TCO (SeTCO) showed a two-fold increase in minimum inhibitory and bactericide concentrations (MIC and MBC) of TCO compared to Salmonella enterica serovar Typhimurium wild-type strain (SeWT) in laboratory growth medium, as well as a greater adaptation and growth rate in the presence of the EOs and a higher survival to TCO treatments in buffers of pH 4.0 and 7.0. The increased resistance of SeTCO was confirmed in skimmed milk: 300 μL/L TCO reduced only 1 log10 cycle of SeTCO population, whereas it inactivated more than 5 log10 cycles in SeWT. Moreover, SeTCO showed an increased cross-resistance against aminoglycosides, quinolones and tetracyclines. Whole genome sequencing revealed 5 mutations in SeTCO: 2 in genes involved in O-antigens synthesis (rfbV and rfbX), 2 in genes related to adaptation to the growing medium (trkA and glpK), and 1 in a redox-sensitive transcriptional regulator (soxR). The phenotypic characterization of a constructed SeWT strain with mutant soxRSeTCO demonstrated that the mutation of soxR was the main cause of the increased resistance and tolerance observed in SeTCO against TCO and antibiotics. The emergence of resistant strains against EOs might jeopardize their use as food preservatives. Further studies will thus be required to determine under which conditions such resistant strains might occur, and to assess the food risk they may pose, as well as to ascertain their impact on the spread of AMR." @default.
• W3205488300 created "2021-10-25" @default.
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• W3205488300 date "2021-12-01" @default.
• W3205488300 modified "2023-10-16" @default.
• W3205488300 title "Salmonella enterica serovar Typhimurium genetic variants isolated after lethal treatment with Thymbra capitata essential oil (TCO) showed increased resistance to TCO in milk" @default.
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• W3205488300 doi "https://doi.org/10.1016/j.ijfoodmicro.2021.109443" @default.
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