A novel Acinetobacter phage reveals altered virulence traits in phage-resistant strains.

A novel Acinetobacter baumannii phage causes capsule loss, reducing bacterial virulence and increasing biofilm formation in resistant strains.

• Why it matters: Understanding how bacteria develop resistance to phages and how this affects their pathogenic traits is crucial for optimizing phage therapy as an alternative to antibiotics.
• What they did: The study isolated a new myovirus targeting A. baumannii, identified capsule loss due to galE gene mutation as a resistance mechanism, and analyzed its effects through genome, transcriptome, and infection models.
• The result: Capsule loss attenuated bacterial virulence and enhanced biofilm formation, while combining phages with antibiotics showed synergistic effects, informing strategies to combat resistant infections.