By J.L. Vegad
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Additional resources for A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals
INFECTIOUS CORVZA so known as 'fowl coryza', infectious coryza is a sudden and severe respiratory disease of chickens. The disease is characterized by swelling of the face and discharges from the eyes and nostrils (Fig. 4, 75). The greatest economic losses occur from poor growth in growing birds, and a marked drop in egg production (10-40%) in layers. ft:J The disease is extremely common both in broilers and layers. Chickens of all ages are susceptible, but older birds suffer more severely. Cause A bacterium called Haemophilus paragallinarum.
Exposure through the respiratory tract is unimportant. Symptoms I. The disease usually occurs w hen chicks are 1-2 weeks of age. Symptoms include depression, muscular incoordination, and tremors. The nervous symptoms may be seen soon after hatching, but are usually I I VIRAL DISEASES A COLOUR ATLAS OF POULTRY DISEASES seen at one week of age. The muscular incoordination varies from slight incoordination to sitting on the hocks, or lying down on one side (Fig. 45). The birds are unable to move. In such a condition , death occurs from not reaching to the feed (starvation), or getting crushed by other members of the flock.
Symptoms Fowl pox can occur at any age. There are two forms of the disease: (I) skin or cutaneous form (dry pox) , and diphtheritic form (wet form) . In the skin form, lesions (changes) appear on the unfeathered skin of the head, neck, comb, wattles, eyelids, legs, and feet. The lesions on the head , combs, and wattles are usually wart-like (nodular) in appearance, and yellow to dark brown in colour (Fig. 36, 37). In the diphtheritic form (wet form), small white nodules are observed in upper respiratory and digestive tracts.
A Colour Atlas of Poultry Diseases: An Aid for Farmers and Poultry Professionals by J.L. Vegad