ISO 15883-2:2006 specifies particular requirements for washer disinfectors (WD) that are intended for use for the cleaning and thermal disinfection, in a single operating cycle, of re-usable medical devices such as surgical instruments, anaesthetic equipment, bowls, dishes and receivers, utensils and glassware. The requirements in ISO 15883-2:2006 apply in addition to the general requirements specified in ISO 15883-1. The specified performance requirements of ISO 15883-2:2006 may not ensure the inactivation or removal of the causative agent(s) (prion protein) of transmissible spongiform encephalopathies.