4.1.3 After the complete process in the WD the endoscope shall be free from vegetative bacteria (but not
necessarily spores) and other contamination. The combination of the cleaning process and the disinfection
process shall be designed to achieve this condition recognising the high level of bacterial contamination that
may exist (1010 per endoscope). It shall be necessary to take into account other factors such as the design of
connectors. Manufacturers shall demonstrate this capability during type testing for all the types of endoscope
that the WD is designed to process. (see, for example, ISO/DTS 15883-5:2004, Annex I).
NOTE The efficacy of the process (including cleaning and disinfection) depends on a number of factors which include
a) the nature (characteristics) of the device being processed;
b) the extent and nature of the soiling to be removed;
c) the temperature;
d) the mechanical energy (type, output);
e) the detergent system;
f) the nature, volume, concentration and temperature of the cleaning and disinfectant solutions and their ability to wet
the surfaces to be cleaned and disinfected;