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Extra resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals

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Affected chicks show depression with a tendency to crowd together in a small space, respiratory distress, loss of appetite and white thick and sticky droppings that adhere to the feathers around the vent. That is, white diarrhoea. The chicks breathe with difficulty and death may soon follow. The peak mortality usually occurs during the 2 nd and 3rd week. Mortality varies greatly and in extreme cases can be 100%. 3. Older birds may appear depressed and have pale shrunken combs with ruffled feathers.

Spread I. The most important method of spread is vertical transmission . That is. from an infected hen through the eggs to the newly hatched chicks. 2. Such newly hatched chicks spread the infection to other chicks in hatcheries through their soft feathers which are heavily contaminated by S. pullorum . 3. Affected chicks shed S. pullorum through the faeces. This is the major method of spread among chicks. 4. Contaminated feed, water and litter can also be a source of S. pullorum infection. 5. Attendants, visitors, feed dealers, and chicken buyers who move from house to house and from farm to farm, may carry infection.

56. f. coli infection (Colisepticaemia) in a 34-day-old broiler chicken. 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.

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