A total of 88 patients were treated with teicoplanin for infections caused by coagulase-negative staphylococci in open clinical studies in France and the UK. Teicoplanin was administered once daily, with a mean dose of 323 mg, for a mean duration of 16 days. Thirty-nine patients received teicoplanin alone while 49 received combination treatment. Clinical cure or improvement occurred in 79 of 82 evaluable cases (96.3%) and bacteriological elimination in 82 cases (95.1%). Treatment with teicoplanin alone was clinically successful in all cases, including 20 septicaemias, and the elimination rate was 93%. There was no apparent correlation between clinical and bacteriological outcomes and results of in-vitro testing. The variation in MICs between France and the UK was attributed to differences in the methods used.