By P. Seneviratna
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Extra resources for Diseases of Poultry. (Including Cage Birds)
How ever, there will be a drop in egg production by 5-20 per cent which may last for a period of 10 days. During this period they are usually viraemic and the virus is shed in the eggs. Infected eggs will show a high mortahty especially during the latter stages of incubation. Some hatched chicks will show signs of tremor during the first few weeks of life. As a rule the disease in chicks 1-14 days old can be attributed to egg transmission. —The lesions are usually microscopic in nature and are caused by focal or diffuse gliosis, perivascular infiltration, neuronal degeneration, and hyperplasia of the lymphoid follicles, primarily of the myocar dium, the proventriculus, and the pancreas.
So far this infection has not been reported from Asia, and it has no great significance in the poultry industry. Its greatest significance lies, however, in the fact that man is susceptible to infection. RABIES This is a well known virus infection of dogs and other mammals including m a n ; the fowl also is susceptible. The incubation period varies but may be as short as 40 days. Birds usually get the infection by being bitten by a rabid dog. Once they are infected they may attack other birds and even man.
Eggs laid by the carrier hens show decreased fertility and low hatchability, and chicks hatched from infected eggs show a high mortality. Further, the egg production in infected birds is lower than in the case of non-infected ones. —The disease is caused by Salmonella pullorum isolated by Rettger in 1900. This is a non-motile Salmonella which when isolated from acute cases in MacConkey agar plates, produces small translucent colonies which are fairly characteristic. Salmonella pullorum ferments glucose and mannitol producing acid and some strains may produce small amounts of gas.