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" Efflux-Mediated Synergy and Preserved in Vitro Selectivity of Zinc Oxide Nanoparticle–Ampicillin Combinations against Multidrug-Resistant Klebsiella Pneumoniae and Pseudomonas Aeruginosa" <em>NIU Journal of Health Sciences</em> [Online], Volume 12 Number 2 (14 September 2026)