Original Article

Isolation, characterization, and antibacterial activity of lytic bacteriophage against methicillin-resistant Staphylococcus aureus causing bedsore and diabetic wounds


Background and Objectives: Phage therapy has gained interest as an alternative treatment for methicillin-resistant Staphylococcus aureus (MRSA) infections. The purpose of this study was to isolate and characterize an effective bacteriophage against isolates of MRSA.
Materials and Methods: Bacteriophage was isolated from hospital sewage. Lytic activity and the titers of phage lysates were measured using spot test and double-layer plaque assay. The phage characterization was determined through transmission electron microscopy. Adsorption rate, host range and stability tests were investigated. The latent period and burst size were estimated from a one-step growth curve. The effect of bacteriophage against MRSA biofilms was determined and Real-time PCR was used to assess the effects of the bacteriophage on the expression of the biofilm-associated genes.
Results: TEM results showed that the phage resembled the Cystoviridae family. Its latent period was 30 min, corresponding to about 71/43 phage particles per infected cell. The phage had a broad host range and it was most stable at 37°C and pH 7. It was sensitive to NaCl concentrations. The expressions of the biofilm-associated genes were significantly reduced in the presence of the phage.
Conclusion: The isolated phage was effective against MRSA strains and it can be an optional strategy of controlling biofilm development.

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IssueVol 14 No 5 (2022) QRcode
SectionOriginal Article(s)
DOI https://doi.org/10.18502/ijm.v14i5.10967
Bacteriophage; Methicillin-resistant Staphylococcus aureus; Phage therapy; Wounds

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How to Cite
Rezaei Z, Elikaei A, Barzi SM, Shafiei M. Isolation, characterization, and antibacterial activity of lytic bacteriophage against methicillin-resistant Staphylococcus aureus causing bedsore and diabetic wounds. Iran J Microbiol. 2022;14(5):712-720.