Using the Damage Response Framework as a Lens to Discuss Acinetobacter baumannii Host-Pathogen Interactions: A Narrative Review and a Call to Action.

The Damage Response Framework (DRF) is a conceptual model that evaluates the outcome of host-pathogen interactions (HPI) by assessing the total damage sustained by the host. The DRF emphasizes that disease results from cumulative host injury arising from the interplay between microbial virulence and the host immune response, rather than from the pathogen alone. HPI has been described as a "tug of war" between a pathogen and a host; the DRF improves this analogy by grounding it in reality, as both excessive immune activation and insufficient pathogen clearance can lead to host damage and disease. Acinetobacter baumannii is a Gram-negative pathogen known for its extensive drug resistance and immunomodulatory capacities. The interaction among isolate-specific virulence traits, antimicrobial resistance mechanisms, and host immune status determines the pattern and extent of damage, illustrating central tenets of the DRF. Different A. baumannii isolates may therefore produce varied clinical outcomes across different host conditions, depending on the extent of damage they cause. This narrative review discusses A. baumannii infections from the perspective of the DRF, highlighting how applying the DRF can inform our current understanding of A. baumannii pathogenesis by assessing A. baumannii HPI. We also provide brief insights into how the DRF can inform future research and treatment strategies that integrate host and microbial factors to minimize overall damage and improve host outcomes.