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Phage Therapy – Bacteriophages Against Infections

Phage therapy uses bacteriophages – viruses that target bacteria – to treat bacterial infections. It is considered a promising alternative to antibiotics.

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Things worth knowing about "Phage therapy"

Phage therapy uses bacteriophages – viruses that target bacteria – to treat bacterial infections. It is considered a promising alternative to antibiotics.

What is Phage Therapy?

Phage therapy is a medical treatment that uses bacteriophages (or phages for short) – viruses that specifically infect and destroy bacteria – to combat bacterial infections. Bacteriophages are entirely harmless to human cells, as they exclusively target bacteria. The therapy is particularly relevant for infections caused by bacteria that are resistant to conventional antibiotics.

The concept of phage therapy is not new: it was pioneered in the 1920s by scientist Félix d'Hérelle and has been clinically applied for decades in Eastern Europe, particularly in Georgia and Poland. With the global rise of antibiotic resistance, phage therapy is experiencing a worldwide revival.

Mechanism of Action

Bacteriophages are highly specialized viruses that bind to specific receptors on the surface of target bacteria. After binding, they inject their genetic material into the bacterium, where it replicates until the bacterium bursts (lysis), releasing new phages that go on to infect further bacteria.

Host specificity: Each phage targets only specific bacterial species or even certain strains, enabling highly precise treatment.
Self-amplification: Phages multiply at the site of infection as long as target bacteria are present.
No effect on human cells: Since phages use only bacteria as hosts, they are directly harmless to the human body.

Areas of Application

Phage therapy is primarily considered when conventional antibiotics fail or cannot be used:

Infections with multidrug-resistant organisms (e.g., MRSA, VRE, multidrug-resistant Pseudomonas aeruginosa strains)
Chronic wound infections and biofilm-associated infections
Urinary tract infections
Pneumonia, especially in patients with cystic fibrosis
Bone and joint infections (osteomyelitis)
Post-surgical infections

Advantages Over Antibiotics

High specificity: Phages act precisely against the causative pathogen without disrupting the beneficial gut microbiome.
Efficacy against resistant bacteria: Phages can be effective even against antibiotic-resistant strains.
Self-dosing at the infection site: Phages replicate where they are needed most.
Combination potential: Phages can be combined with antibiotics to enhance their effectiveness.

Challenges and Limitations

Despite their promising properties, phage therapy still faces significant challenges in Western countries:

Regulatory hurdles: Phage therapy is not yet routinely approved in the EU or the USA. It is typically used within clinical trials or as a compassionate use authorization in individual cases.
Phage resistance: Bacteria can develop resistance to phages, similar to antibiotic resistance.
Individualization: Identifying the right phage for a specific pathogen requires extensive diagnostic workup.
Immunogenicity: The patient's immune system may recognize phages as foreign and neutralize them.
Lack of large-scale studies: Comprehensive randomized controlled trials confirming efficacy and safety on a large scale are still lacking.

Routes of Administration

Phages can be administered in various ways depending on the type and location of the infection:

Intravenously (directly into the bloodstream)
Topically applied to wounds
Inhaled for lung infections
Orally for gastrointestinal infections

Current Research and Clinical Trials

Numerous clinical trials on phage therapy are underway worldwide. Military institutes in Georgia and Poland have decades of practical experience. In Europe and the United States, phage therapies are being tested against MRSA infections, Pseudomonas infections in cystic fibrosis patients, and biofilm infections on implants. Several remarkable case reports – including a case at UC San Diego in 2017 – have demonstrated that phage therapy can be successful even in life-threatening infections.

References

Gordillo Altamirano, F. L. & Barr, J. J. (2019): Phage therapy in the postantibiotic era. Clinical Microbiology Reviews, 32(2), e00066-18. PubMed.
World Health Organization (WHO) (2020): Antibiotic resistance. WHO Fact Sheets. Geneva.
Sulakvelidze, A., Alavidze, Z. & Morris, J. G. (2001): Bacteriophage therapy. Antimicrobial Agents and Chemotherapy, 45(3), 649–659. PubMed.

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