Three aspects of haemodialysis are of special concern to the microbiologist: (1) the hepatitis risk, (2) shunt sepsis, and (3) the hygiene of the equipment used. It is suggested that the risks of infection and cross-infection in haemodialysis units may be diminished by several measures, including the avoidance of overcrowding the patients, setting up codes of practice for the staff, topical disinfection of the patient's skin, and sterilization of equipment. In addition pathologists should emphasize to laboratory staff dealing with specimens from patients that these carry major risks to health.