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Additional resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals
47 BACTERIAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES Fig. 68. Necrotic enteritis in the caeca of a lO-day-old broiler chicken. The right caecum is cut open. It shows necrotic lesions and minute haemorrhages. The caecum also had mild coccidiosis . Fig. 69. Necrotic enteritis in the caeca of the same lO-day-old broiler chicken shown in Fig. 68. Both the caeca are cut open. They reveal necrotic lesions and minute haemorrhages. ;;S~_ _ _~~_ _ A COLOUR ATLAS OF POULTRY DISEASES GANGRENOUS DERMATITIS G angrenous dermatitis is characterized by areas of death and putrefaction in the skin and underlying tissues, including muscle.
Note lesions on the comb (arrow) and eye of a chicken . 24 VIRAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES Fig. 37. Fowl pox (skin form) . Note lesions on the comb of a chicken (arrow). Fig. 38. Fowl pox (diphtheritic form) in a 40-week-old layer chicken. Note the presence of cheesy plaques (masses) in the larynx and adjacent trachea (arrow). 2S A COLOUR ATLAS OF POULTRY DISEASES VIRAL DISEASES Fig. 39. Fowl pox (diphtheritic form) in another 40-week-old layer chicken. Note the presence of cheesy plaques (masses) in the larynx and adjacent trachea (arrow).
In laying birds, the disease causes great economic loss through reduced egg production and poor eggshell quality. Both in broilers and layers, infection causes poor weight gain and feed efficiency. Birds of all ages are susceptible but the disease is most common in young chicks, causing some mortality. Cause A virus - called coronavirus. The virus survives outside the bird under farm conditions for weeks to months. However, it is rapidly killed by common disinfectants. Spread I. By the air. As the virus is easily spread by air, inhaling infected air is the most important means of spread .