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==Description==

==Description==

Lamb dysentery is a peracute and fatal enterotoxaemia of young lambs caused by the beta and epsilon toxins of ''Clostridium perfringens'' type B. ''C. perfringens''  is a large, gram positive, anaerobic bacillus that is ubiquitous in the environment and commensalises the gastrointestinal tract of most mammals^ivis. Five genotypes of ''Clostridium perfringens'' exist, named A-E, and all genotypes produce potent exotoxins. There are 12 exotoxins in total, some of which are lethal and others which are of minor significance^lewis.The enterotoxaemias are a group of diseases caused by proliferation of ''C. perfringens'' in the lumen of the gastrointestinal tract and excessive production of exotoxin.

Lamb dysentery is a peracute and fatal enterotoxaemia of young lambs caused by the beta and epsilon toxins of ''Clostridium perfringens'' type B. ''C. perfringens''  is a large, gram positive, anaerobic bacillus that is ubiquitous in the environment and commensalises the gastrointestinal tract of most mammals^ivis. Five genotypes of ''Clostridium perfringens'' exist, named A-E, and all genotypes produce potent exotoxins. There are 12 exotoxins in total, some of which are lethal and others which are of minor significance^lewis. These are produced as pro-toxins, and are converted to their toxic froms by digestive enzymes. The enterotoxaemias are a group of diseases caused by proliferation of ''C. perfringens'' in the lumen of the gastrointestinal tract and excessive production of exotoxin.

 

. ''Clostridium perfringens'' is a normal intestina commensal of the sheep which can cause enteroroxaemia under certain conditions.  In healthy animals a balance exists between multiplication and passage into faeces, maintaining a loew level of infection. C. perfringens is saccharolytic and can multiply rapidly when the anaerobic conditions in the abomasum ans small intesting are combined with the presence of of large quantities of fermentable carbohydrate. Conditions whish result in gut stasis, such as insufficient dietary fibre or severe gastrointestinal parasitism, may also contribute to the build up of toxins in the intestine. C. perfringens bacteria produce non-toxic protoxins which are converted to toxins by the action of digestive enzymes and the pathology of the enterotoxaemia is determined by the combination and amounts of these toxins.

Infection with Clostridium  perfringens  types B and C causes severe enteritis, dysentery, toxemia, and high mortality in young lambs, calves, pigs, and foals. Types B and C both produce the highly necrotizing and lethal β toxin that is responsible for severe intestinal damage. This toxin is sensitive to proteolytic enzymes, and disease is associated with inhibition of proteolysis in the intestine. Sow colostrum, which contains a trypsin inhibitor, has been suggested as a factor in the susceptibility of young piglets. Type C also causes enterotoxemia in adult cattle, sheep, and goats. The diseases are listed below, categorized as to cause and host. C  perfringens  also has been associated with hemorrhagic enteritis in dogs. (See also  intestinal diseases in horses,  Intestinal Diseases in Horses and Foals: Introduction.)

Infection with Clostridium  perfringens  types B and C causes severe enteritis, dysentery, toxemia, and high mortality in young lambs, calves, pigs, and foals. Types B and C both produce the highly necrotizing and lethal β toxin that is responsible for severe intestinal damage. This toxin is sensitive to proteolytic enzymes, and disease is associated with inhibition of proteolysis in the intestine. Sow colostrum, which contains a trypsin inhibitor, has been suggested as a factor in the susceptibility of young piglets. Type C also causes enterotoxemia in adult cattle, sheep, and goats. The diseases are listed below, categorized as to cause and host. C  perfringens  also has been associated with hemorrhagic enteritis in dogs. (See also  intestinal diseases in horses,  Intestinal Diseases in Horses and Foals: Introduction.)