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Gene Amplification Boosts A. baumannii Host Fitness, But Cuts Antibiotic Resistance

Study finds ISAba1-mediated crp-osmC amplification boosts Acinetobacter baumannii host fitness but increases antibiotic susceptibility, revealing an evolutionary trade-off.

This research matters because it reveals a hidden driver of hospital infections: <em>Acinetobacter baumannii</em> can rapidly adapt to patients not only through classic antibiotic resistance genes but also by amplifying a metabolic gene cluster that enhances survival in the host. The trade-off observed—reduced biofilm and increased antibiotic susceptibility—suggests that targeting this amplification could make infections easier to treat. As multidrug-resistant <em>A. baumannii</em> continues to threaten hospitalized patients worldwide, understanding these evolutionary compromises may open new avenues for therapeutic strategies and infection control.