Keywords: ماکروفاژ صفاقی مری; Drug resistant Staphylococcus aureus; Murine peritoneal macrophage; Oxidative stress; Antioxidant enzymes; Nanoconjugated vancomycinCAT, Catalase; CFU, colony formation unit; DNPH, 2,4-dinitrophenyl hydrazine; DTNB, 5′,5′-dithio (bis)-2-nitrobenzoic acid;