Phage PASA16 Achieves 86.6% Victory Over Antibiotic Resistant Infections

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An international research effort led by the Israeli Phage Therapy Centre (IPTC) has yielded promising results in the treatment of tough Pseudomonas aeruginosa infections using a phage called PASA16. This groundbreaking study, led by Prof. Ran Nir-Paz at Hadassah Hebrew University Medical Centre and Prof. Ronen Hazan of the Faculty of Dental Medicine at The Hebrew University of Jerusalem has demonstrated an impressive 86.6% success rate in combating these challenging infections.

The study’s findings shed light on the potential of phage therapy, a method that employs specific anti-bacterial viruses, as an alternative and complementary approach to address antibiotic-resistant infections. The study was published in Med. 

Pseudomonas aeruginosa is a versatile bacterium found in various environments, including soil, water, plants, and human bodies. It is known to cause infections in individuals with weakened immune systems or underlying health conditions, often leading to serious complications. The bacteria’s ability to form protective biofilms makes treatment difficult, necessitating novel approaches like phage therapy. 

The study, which involved 16 patients with persistent Pseudomonas aeruginosa infections, stands as the largest of its kind. Prior to treatment, the patients’ Pseudomonas aeruginosa isolates were tested for sensitivity to the PASA16 phage, and only those found sensitive were included in the personalized treatment process. The PASA16 phage treatment, administered via various methods such as intravenous, local application, and topical use, exhibited minor and manageable side effects. 

Remarkably, out of the 15 patients with available data, 13 achieved favourable clinical outcomes, showcasing an impressive 86.6% success rate. This success indicates the potential of combining PASA16 phage with antibiotics as a promising strategy for patients who previously had unsuccessful treatments. The duration of treatment varied between eight days and six weeks, with the majority lasting around two weeks and involving one- to twice-daily regimens. 

The significance of these findings extends beyond this study, as they highlight the efficacy of phage therapy against challenging Pseudomonas aeruginosa infections that have resisted conventional treatments. This success could potentially serve as a blueprint for future clinical trials, paving the way for the development of effective protocols. 

Prof. Ran Nir-Paz expressed enthusiasm about the results, emphasizing the hope this research brings to patients with persistent infections. He highlighted the potential of phage therapy as a valuable alternative to conventional antibiotics in combating antibiotic-resistant pathogens. Prof. Ronen Hazan echoed this sentiment, emphasizing the encouraging nature of the 86.6% success rate and the potential of phage therapy as an alternative solution to antibiotic-resistant infections. 

As antibiotic resistance continues to pose a global challenge, this compassionate use case series holds significant promise in the realm of phage therapy. The study, which utilized a specific phage known as PASA16, represents a significant stride in investigating the potential of phage therapy to combat Pseudomonas aeruginosa infections. 

Phage therapy, the administration of anti-bacterial viruses targeting specific infections, has garnered increasing attention as a supplementary approach to conventional antibiotics. Although clinical trials in this domain have been limited, recent cases of compassionate phage therapy have shown potential, although evidence remains scarce. 

The study’s comprehensive clinical data on 15 out of 16 patients treated with the PASA16 phage provides a robust foundation for assessing the efficacy of this approach. Patients received phage treatment through various methods, and the majority experienced favourable outcomes, highlighting the potential of phage therapy in treating antibiotic-resistant infections. 



The Israeli Phage Therapy Centre’s research into the use of the PASA16 phage to combat persistent Pseudomonas aeruginosa infections is a significant breakthrough. The study’s promising results indicate that phage therapy could be a viable alternative and complementary method for tackling challenging infections that do not respond to traditional treatments. The success observed in this study provides a strong impetus for further research and exploration of phage therapy’s potential against antibiotic-resistant infections. 

As the fight against antibiotic resistance intensifies, compassionate use cases like this one are essential to explore new avenues for treatment. By successfully targeting the complex Pseudomonas aeruginosa infections, this study underscores the potential of phage therapy as a promising solution and sets the stage for future clinical trials and advancements in the field. 

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