Abstract
In this study, we screened bacterial strains to identify specific probiotics to treat pig diarrhea caused by Escherichia coli or Salmonella. The potential probiotics were assayed for their survival in gastrointestinal solution, their antimicrobial activity, cell-surface properties, adhesion to Caco-2 cells, and inhibition of pathogen adhesion. Nine out of the 20 strains tested showed high tolerance of a simulated gastrointestinal environment and six strains exerted antagonistic effects against enterohemorrhagic E. coli (EHEC) O157:H7 and Salmonella Typhimurium MQ. Lactobacillus johnsonii pDX1e exhibited a higher potent antibacterial activity. Four strains (pDX1a, pDX1e, pDX3a, and pDX5a) displayed auto-aggregation, hydrophobicity, and adhesion to Caco-2 cells similar to those of the reference strain Lacticaseibacillus rhamnosus GG (LGG). Enterococcus durans pDX5a showed the highest adhesion capacity (13.86%), followed by the reference strain LGG (11.20%). All the tested strains competitively suppressed the attachment of pathogens to Caco-2 cells (by 30.73–55.18%); L. johnsonii pDX1e and Ent. durans pDX5a significantly inhibited the adhesion of pathogens by substitution and exclusion, respectively. Therefore, pDX1e and pDX5a were selected as probiotic strains for further investigation and application.
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Acknowledgements
This study was supported by the National Key R & D Program of China (2018YFD0501804, 2018YFD0502305), Agriculture Research System of MOF and MARA (CARS-37), and the State Key Laboratory of Veterinary Etiological Biology Project. We thank International Science Editing (http://www.internationalscienceediting.com) for editing this manuscript.
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Wang, Y., Jia, D., Wang, Jh. et al. Assessment of probiotic adhesion and inhibitory effect on Escherichia coli and Salmonella adhesion. Arch Microbiol 203, 6267–6274 (2021). https://doi.org/10.1007/s00203-021-02593-z
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DOI: https://doi.org/10.1007/s00203-021-02593-z