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Evaluation of Specific Bacteriophage Against Salmonella Infantis and Its Antibacterial Effects Compared to Ciprofloxacin in in Vitro Conditions Publisher



Zadeh MRE1 ; Yazdi MKS2, 3 ; Rajabi Z4 ; Harati FA1 ; Nikkhahi F1, 5 ; Yazdi SS6 ; Hassanpour G7 ; Sefidan AM3 ; Dallal MMS1, 4
Authors
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Authors Affiliations
  1. 1. Dept. of Pathobiology, Faculty of Public Health, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Zoonosis Research Center, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Dept. of Medical Laboratory Sciences, Faculty of Allied Medical Sciences, Tehran University of Medical Sciences, Tehran, Iran
  4. 4. Food Microbiology Research Center, Tehran University of Medical Sciences, Tehran, Iran
  5. 5. Medical Microbiology Research Center, Qazvin University of Medical Sciences, Qazvin, Iran
  6. 6. Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  7. 7. Center for Research of Endemic Parasites of Iran, Tehran University of Medical Sciences, Tehran, Iran

Source: Journal of Advances in Medical and Biomedical Research Published:2022


Abstract

Background & Objective: Phage therapy could be used as an alternative method to antibiotic treatments. The purpose of this study was to evaluate the antibacterial activities of isolated lytic bacteriophage against ciprofloxacin-resistant strain of Salmonella infanits in vitro conditions. Materials & Methods: The standard strain of Salmonella infantis and its specific bacteriophage was isolated by soft agar method. Phage susceptibility to heat and pH was evaluated by the Double-Layer Agar method. In vitro assay was carried out on human epithelial type 2 (HEp-2) cells to investigate the effect of bacteriophage on the cytotoxic and invasion of Salmonella infantis to human epithelial cells. Results: Head and tail morphology of bacteriophages against Salmonella infantis were identified by transmission electron microscopy and assigned to the Myoviridae family. The results of the double-layer agar assay showed that the titer of bacteriophages was 1.8×107 PFU/ml. bacteriophage was stable at 4 ֯C and the best quantification of bacteriophage was determined at pH=8. The isolated bacteriophage was specific for Salmonella infantis and had no lytic activity against other pathogenic bacteria. In the evaluation of the binding and invasion of Salmonella infantis to the HEp-2 cell line, as expected, the lytic activity of specific bacteriophage was observed following inoculation. Conclusion: Additional studies are needed for better understanding of the interaction between phage, microorganisms and human host before applying phage therapy on a large scale. © The Authors.