The patients for the trial are to be recruited in the Renal Unit at SCGH and at enrolment a nasal swab is taken to see if the patients has nasal carriage of S. aureus. The patient is also given a prescription for 5% TTO nasal ointment which was filled by the SCGH pharmacy. The application of medication will follow the usual procedure which consists of bi-daily nasal application for 5 days and then weekly application for the next 25 weeks of the trial. The patients are not blinded and are given all their medication at one dispensing which consists of 3 × 10 g tubes of 5% TTO. The patients have weekly assessments for the first 6 weeks of the trial and then 4 weekly assessments until week 26. All assessments are conducted during routine dressing changes or routine visits and are conducted by specially trained dialysis nurses. During each visit the catheter site is examined for any signs of infection and the findings documented on a questionnaire. Suspected cases of infection are identified by trained nurses and the consultant physician will then examined the patient. The findings will be documented by the nurse on a questionnaire and submitted to the primary investigator for review, confirmation, and classification. The primary endpoint is the proportion of patients with a catheter-related infection within 6 months after entry into the study. The infections included: (1) exit site infection (ESI); (2) tunnel infections; and (3) bacteraemia. The endpoint is evaluated by the primary investigator according to the definitions for catheter-related infections. Cases with "definite" and "probable" infections will be classified as infections.