Enzyme therapy of infected wounds and ulcerating lesions is a rapidly developing field, in which there is great promise. It is said that John Hunter used crude pancreatic enzymes in the treatment of wounds. The maggot treatment of dirty chronic infected wounds and osteomyelitis cavities was undoubtedly effective because of proteolytic enzymes secreted by the maggots.1The modern methods of enzyme treatment using purified materials have been developed only in recent years.2Papain3was used as long ago as the First World War for cleansing of infected burns and dirty wounds but was abandoned because of the severe irritation it caused. It was with streptokinase and streptodornase4that the first well-controlled studies of this type of therapy were made.5-8Trypsin, a proteolytic enzyme obtained from the pancreas, is a stronger digestive enzyme, which has been used with success in debridement.9-11Bovine plasmin (fibrinolysin) has