Heterogeneous Klebsiella pneumoniae Co-infections Complicate Personalized Bacteriophage Therapy

Area of Science:

• Microbiology
• Infectious Diseases
• Therapeutic Strategies

Background:

• Multidrug-resistant (MDR) organisms present a growing global health challenge.
• Bacteriophage therapy offers a promising alternative for treating infections caused by MDR pathogens.
• Challenges in phage therapy include bacterial resistance and the presence of diverse bacterial subpopulations.

Purpose of the Study:

• To investigate the efficacy of phage therapy in treating a patient with multifocal urinary tract infections caused by MDR Klebsiella pneumoniae.
• To address the failure of initial phage therapy attempts due to polyclonal co-infectious cells.
• To develop an optimized phage therapy approach for complex, heterogeneous infections.

Main Methods:

• Initial phage therapy attempts were unsuccessful due to polyclonal bacterial populations.
• The patient underwent percutaneous nephrostomy (PCN) to facilitate treatment delivery.
• A bacteriophage cocktail was developed against 21 heterogeneous Klebsiella pneumoniae isolates.
• The phage cocktail was administered via kidney and bladder irrigation, combined with antibiotic treatment.

Main Results:

• Three initial phage therapy regimens failed to resolve the infection.
• The combination of a tailored phage cocktail, PCN, and antibiotics led to successful eradication of the MDR Klebsiella pneumoniae infection.
• The patient showed significant clinical improvement, particularly in bladder function.

Conclusions:

• Bacterial heterogeneity and the presence of polyclonal co-infectious cells can lead to phage therapy failure.
• A customized bacteriophage cocktail, delivered effectively via PCN and combined with antibiotics, can overcome complex infections.
• This case highlights a viable strategy for treating challenging MDR infections using phage therapy.