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The lower limit of detection of colony forming units per milliliter (CFU/mL) was 1.7 log10 CFU/mL. Cefazolin was considered bactericidal when it decreased bacterial density by ≥3 log10 CFU/mL from the initial inoculum after 24 hours of incubation. Results Cefazolin produced mean 24-hour CFU changes of -4.39 to -4.89 log10 CFU/mL against MRSA isolates with MICs from 64 to 512 mg/L. Cefazolin demonstrated bactericidal activity against all studied MRSA isolates and no regrowth was observed at 24 hours. Conclusions The mean cefazolin tissue c