Từ điển thú y vần E | E Poultry Coliform septicaemia is a frequent cause of loss and one difficult to control since infected birds are disinclined to eat or drink which hinders drug administration. E. Coli Escherichia coli formerly known as Bacillus coli is a normal inhabitant of the alimentary canal in most mammals. This bacterial family is a large one comprising many differing serotypes which can be differentiated in the laboratory by means of the agglutination test. Only a few serotypes cause disease. However E. coli infections can be severe and have become sufficiently prevalent for a range of vaccines to be developed for protection against the most common pathological strains in farm animals. See also DIARRHOEA JOINT-ILL COLIFORM INFECTIONS. Sheep E. coli scours and septicaemia are common in newborn lambs and often fatal. Vaccines are available for protection and antisera may be used for treatment. Pigs One serotype gives rise to oedema of the bowel another to the death of piglets within a few days of birth. Those strains of E. coli which cause diarrhoea in piglets only a few days old are able to do so because they are covered with an adhesive coat known as the K88 antigen. This enables them to adhere to the wall of the intestine where they induce disease by means of toxins causing diarrhoea dehydration and death. E. coli toxins are classified as a heat labile LT which may cause severe diarrhoea dehydration and death of piglets and b heat stable ST associated with only a mild enteritis. Scouring in older pigs may often be caused by strains of E. coli having no K88 antigen. The K88 antigen and related antigens can be prepared in the form of a vaccine formulated with E coli toxoids. This is injected into pregnant sows and gilts to provide protection passive immunity to the piglets when they are suckled via the colostrum by preventing the K88-coated E. coli from adhering to the intestinal wall. Oral and parenteral vaccines are available. Cattle E. coli is an important cause of calf .
