Phage Therapy: Combating Antibiotic Resistance

Phage therapy is emerging as a targeted alternative to traditional antibiotics, specifically for treating bacterial infections that have become resistant to standard antimicrobial medicines. This approach utilizes bacteriophages, or phages, which are viruses that selectively target and kill bacteria.

According to the World Health Organization (WHO), phages are particularly useful because they can destroy bacteria that are resistant to antibiotics, providing a critical tool in the fight against antimicrobial resistance.

Mechanisms of Phage Action

Phages used for therapeutic purposes are lytic. This means they infect and destroy bacterial cells, a process that effectively prevents the onward spread of an infection.

A defining characteristic of phage therapy is its high specificity. Phages target only their specific bacterial hosts and do not infect human cells.

This specificity allows phages to kill disease-causing bacteria without disrupting the body’s normal microbiota or causing significant side effects, which is a common issue with broad-spectrum antibiotics.

Personalized Treatment and Synergy

Because of their precision, phages are described in medicine as a form of personalized medicine, where treatments are adapted to each patient individually to match the specific bacterial infection they are fighting.

To address a wider range of pathogens, phages can be combined into mixtures. These mixtures are designed to target the most common infections.

phages can be used alongside antibiotics. This combined approach can enhance the efficacy of the treatment, particularly when treating infections caused by antibiotic-resistant bacteria.

Advanced Research and Bioengineering

Beyond the use of naturally occurring phages, researchers are exploring bioengineered options to overcome multi-drug resistance. One such application involves using bioengineered phages to deliver a CRISPR/Cas program.

This programmed delivery is intended to disrupt antibiotic resistance genes and destroy the antibiotic-resistant bacteria.

The potential applications for phage therapy extend beyond human health. Phages can be used for the treatment and prevention of infections in animals and plants, and potentially within the environment.

Regulatory Status and Clinical Availability

Despite the scientific potential, the regulatory status of phage therapy varies significantly by geography. In some countries in the eastern part of the WHO European Region, phages are used more broadly to treat bacterial infections, especially in cases where antibiotics have failed.

In most other countries, however, phages are not approved as biological medicinal products. This means they are not yet standard approved medicines.

phage therapy is primarily used on compassionate grounds. This occurs in life-threatening situations where all other treatment options have been exhausted.

The path toward wider therapeutic use in humans requires more data. The WHO has noted that further evidence from clinical studies is needed before phages can become more widely available for general therapeutic use.