Efficacy of ϕkm18p phage therapy in a murine model of extensively drug-resistant Acinetobacter baumannii infection

Jiun Ling Wang, Chih Feng Kuo, Che Ming Yeh, Jung Ren Chen, Ming Fang Cheng, Chih Hsin Hung

Research output: Contribution to journalReview articlepeer-review

31 Citations (Scopus)


Purpose: Few effective antibiotics are available for treating extensively drug-resistant Acinetobacter baumannii (XDRAB) sepsis. Phage therapy may show potential in treating XDRAB infections. Materials and methods: We studied ϕkm18p phage therapy in BALB/c and C57BL/6 mice models of XDRAB bacteremia. Results: We observed survival rates of nearly 100% in groups given phage therapy concurrent with XDRAB at different multiplicities of infection. In mice that received phage therapy after a 1-hour delay, the survival rate decreased to about 50%. The bacterial load in the blood decreased from 108 to 102 and 103 colony-forming units (CFU)/mL in the concurrent treatment group. In the phage therapy group, the levels of the cytokines, such as tumor necrosis factor alpha (TNF-α) and interleukin-6 (IL-6), were low at 3 hours after infection. Although some phage-resistant mutants were isolated after phage therapy, a cytotoxicity study showed that they had reduced fitness. Conclusion: Phage therapy in XDRAB bacteremia increased the animal survival rates, decreased the bacteremia loads, and decreased the levels of inflammatory markers TNF-α and IL-6. However, the reduced therapeutic effect with delayed administrations may be a concern in developing a successful phage therapy for treating acute infections of multidrug-resistant pathogens.

Original languageEnglish
Pages (from-to)2301-2310
Number of pages10
JournalInfection and Drug Resistance
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Infectious Diseases
  • Pharmacology (medical)


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