Related Experiment Video

Updated: May 22, 2026

Separating Bacteria by Capsule Amount Using a Discontinuous Density Gradient
05:52

Separating Bacteria by Capsule Amount Using a Discontinuous Density Gradient

Published on: January 7, 2019

Capsule modulation enhances immunity and delays resistance in MDR Acinetobacter baumannii

Fangfang Shen1,2, Yuanfei Wang3, Qiong Wu1,4

  • 1Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui 230027, China.

Iscience
|May 21, 2026
PubMed

Insights

Bacteriophage resistance in multidrug-resistant Acinetobacter baumannii (MDRAB) leads to capsule loss, reducing virulence. Adapted phages combined with antibiotics effectively treat MDRAB infections, overcoming resistance.

Area of Science:

  • Microbiology
  • Infectious Diseases
  • Bacteriophage Therapy

Background:

  • Multidrug-resistant Acinetobacter baumannii (MDRAB) poses a significant clinical challenge.
  • Bacteriophages offer targeted therapy but face rapid resistance development.
  • Phage resistance can alter bacterial virulence and immune evasion.

Purpose of the Study:

  • To investigate the mechanisms of phage resistance in MDRAB.
  • To develop adapted bacteriophages for overcoming resistance.
  • To evaluate combination therapy of phages and antibiotics against MDRAB.

Main Methods:

  • Isolation of a lytic bacteriophage (WYF231108.1) targeting a clinical MDRAB isolate.
  • Generation of phage-resistant MDRAB derivatives through serial passage.
  • Genomic and phenotypic analysis of resistant strains and adapted phages.
  • In vitro and in vivo evaluation of phage-antibiotic combination therapy.

Main Results:

  • Phage resistance in MDRAB was linked to capsule attenuation and reduced virulence.
  • Adapted phages regained activity against resistant strains.
  • Phage-antibiotic combinations suppressed resistant MDRAB outgrowth in vitro.
  • Combination therapy improved survival in murine infection models.

Conclusions:

  • Phage resistance in MDRAB involves an evolutionary trade-off with reduced pathogenicity.
  • Capsule attenuation in resistant strains creates a therapeutic vulnerability.
  • Adapted phage-antibiotic regimens offer a promising strategy to combat MDRAB infections.
Keywords:
bacteriologymicrobiology

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