 Clinical recognition of these rating stages is not easy because there are no clear descriptors. However, Soriano et al 2004 defined classification according to the number of bacteria present in the wound bed: Contamination-103 colony-forming unit CFUs per gram of tissues; colonised -104 CFUs ; Infection -105 CFUs. Cutting and White noted several aspects of wound infection such as: serous drainage with concurrent inflammation, discoloured granulation tissue, pocketing at the wound base, unexpected pain , foul odour, increase in exudates, exudates that becomes purulent instead of serous, and wound breakdownWhite Cutting, 2006. 