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3. Older birds may appear depressed and have pale shrunken combs with ruffled feathers. Low egg production may be the only symptom of the disease when adult birds are affected. The condition, however, is rare in adult birds. Postmortem Findings I. Chicks may have an inflamed, unabsorbed yolk sac. The lungs may be congested and the liver dark and swollen with haemorrhages visible on surface. 2. Chicks that die after showing signs for I or 2 days show inflammation of the caeca. The caeca are enlarged and distended with hard, dry, necrotic (dead) material.
Note thick, yellowish , adherent, caseous fibrinous material on the liver. This is characteristic of the advanced stage of E. coli infection. 40 BAC T ERIAL DISEASES A COLOUR ATLAS OF POULTRY D ISEASES Fig. 57. f. coli infection (Colisepticaemia) in another 34-day-old broiler chicken. Note thick white fibrin layer covering the heart and liver, typical of advanced f. coli infection. Fig. 58. E. coli infection (Colisepticaemia) in yet two other 34-day-old broiler chickens showing thick white fibrin layer on the liver and heart, characteristic of advanced E.
Live and killed vaccines can be given which produce a lasting and adequate degree of protection . Fig. 45 . Muscular incoordination and recumbent (lying down) position of chicks. This may be due to avian encephalomyelitis. or deficiency of vitamin A, or E. 32 BACTERIAL DISEASES E.. coli Infection (Colibacillosis) E scherichia coli infection or colibacillosis is the most common, the most widely prevalent, and economically the most important bacterial disease of poultry in our country. It may be seen right from the day-old chick as yolk sac infection up to the adult bird as egg peritonitis.