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The safety and efficacy of intravenous mezlocillin were determined in 25 patients with aerobic, anaerobic, and mixed infections. Included were pleuropulmonary, urinary tract, skin, and soft-tissue infections, osteomyelitis, and abdominal and breast abscess. Nineteen patients (76%) were cured without recurrence as determined by clinical and bacteriological parameters. In three, the infection recurred (12%); two patients failed (8%), and in one, it was indeterminate (4%). No serious adverse effects were noted except for severe thrombophlebitis in three (12%) patients. Our preliminary data suggest that mezlocillin is a safe (except for thrombophlebitis) and effective antibiotic in the treatment of aerobic, anaerobic, and mixed infections.