By J.L. Vegad
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Extra resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals
2. Precautions should be taken to minimize the spread of the vaccine virus , both on the birds and in the environment. Being a live virus, it is capable of spreading the disease and therefore must be handled carefully. 3. Carcasses of dead or affected birds should be buried or burnt. After removal of the birds the house should be thoroughly disinfected, although the virus remains in the infected scabs and is difficult to clear from certain premises. Fig. 36. Fowl pox (skin form). Note lesions on the comb (arrow) and eye of a chicken .
Lesions in the nares (nose) give rise to nasal discharge, while those on the conjunctiva to eye discharge. Fowl pox usually causes weakness and poor weight gain. In layers, egg production is temporarily stopped . Mortality is low (I to 2%) when skin lesions are present, but may be as high as 50% with the diphtheritic form , but is usually low. Diagnosis Wart-like lesions of the head particularly of the comb and around the eyes, or yellow cheesy lesions in the larynx and adjacent trachea on postmortem, are diagnostic of fowl pox.
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. It is quite a common disease. Also known as "wing rot", gangrenous dermatitis is a serious disease and usually results in death.
A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals by J.L. Vegad