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Brains Of Disease: When it was shown that the brains of diseased animals contained the virus, the way was opened for prevention of the disease. In 1885, Louis Pasteur successfully treated a peasant boy, severely bitten by a rabid dog, with a series of injections of a preparation of the virus. In the early 1900's characteristic changes in the nerve cells of infected human beings and animals (Negri bodies, after Adelchi Negri) were first described. This discovery permitted rapid diagnosis of the disease.
Mycoplasmosis is a respiratory disease caused y the bacteria Mycoplasma gallisepticum. It is Iso known as air sac disease or chronic respira-jry disease. Those affected with the disease may how nasal discharge, watery eyes, and respira-)ry difficulty. This disease is often associated /ith other respiratory diseases. It is transmitted hiefly from infected hens to their chicks through le eggs. The disease can also be transmitted by ontact with infected individuals, but it spreads ery slowly in this manner. The disease can best e controlled by maintaining breeding flocks free f the disease by strict measures of isolation and mitation. Chicks hatched from such flocks can egin life free of the disease.
Marek's disease is primarily a disease of young chickens from 2 to 5 months of age. It is also known as jowl paralysis and neural lym-phomatosis. Nerve-tissue rumors that cause paralysis of both legs and wings are the most common form of this disease, but the tumors may also affect the viscera, eyes, and gonads. The disease is probably caused by a virus.
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