The effects of different treatments on the number of bacteria isolated from the kidneys of NMRI mice, 10 days after they were inoculated intravenously with S. aureus strain LS-1 (n = 9–19). **P < 0.005; NS, not significant (*P < 0.05). CFU, colony-forming units; CLOX, cloxacillin; PBN, phenyl-N-tert-butyl nitrone.