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The Disease Is Prev-nt: Such control measures have been effective in eventing rabies in Great Britain, the Nether-ids, Switzerland, Austria, Canada, and several tes in the United States. The disease is prev-nt, however, in Mexico, Spain, Italy, and ia (especially in India and the Near East), bies has been found in bats in Mexico, Central icrica, the United States, and Europe; vampire s in these areas may be important in the spread the disease there.
Consult Rivers, Thomas M., Viral and Rickettsial 'ases of Man, 3d ed. (Philadelphia 1959).
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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