A method for generation phage cocktail with great therapeutic potential

Area of Science:

• Microbiology
• Bacteriophage Therapy
• Antimicrobial Resistance

Background:

• Bacteriophage therapy offers an alternative to antibiotics for multidrug-resistant bacteria.
• Phage resistance in bacteria limits the efficacy of monophage treatments.
• Developing strategies to overcome bacterial resistance is crucial for phage therapy's success.

Purpose of the Study:

• To establish a "Step-by-Step" (SBS) method for creating phage cocktails effective against resistant bacterial strains.
• To evaluate the therapeutic potential of an SBS-derived phage cocktail against Klebsiella pneumoniae infections.
• To compare the efficacy of the phage cocktail with monophage treatments in a murine model.

Main Methods:

• The Step-by-Step (SBS) method was employed to select phages targeting both wild-type and resistant bacterial variants.
• A phage cocktail comprising three lytic phages (GH-K1, GH-K2, GH-K3) for Klebsiella pneumoniae was developed.
• The efficacy of the phage cocktail was assessed in a murine bacteremia model, including delayed administration.

Main Results:

• The phage cocktail significantly reduced Klebsiella pneumoniae mutation frequency compared to single phages.
• Treatment with the phage cocktail effectively rescued mice from Klebsiella pneumoniae bacteremia.
• The minimal protective dose of the phage cocktail was substantially lower than that of individual phages, demonstrating enhanced potency.
• Phage-resistant variants exhibited significantly reduced virulence compared to the wild-type strain.

Conclusions:

• The SBS method successfully generated a phage cocktail with enhanced therapeutic efficacy against Klebsiella pneumoniae.
• The phage cocktail demonstrated superior performance in reducing bacterial mutation frequency and treating bacteremia compared to monophages.
• Phage cocktails developed using the SBS method hold significant promise for treating multidrug-resistant bacterial infections.