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Mental Disease Has Started: Without the environmental stimulus, the child may entirely escape the predisposition; even when a mental disease has started, its progress is ordinarily determined by factors other than heredity. No disorder is incurable because of its hereditary components (22, 1953). A follow-up study (31, 1945) of children of alcoholic and psychotic parents twenty years after they had been placed in foster homes, showed no child of psychotic parents who became psychotic arid none of alcoholic parents who became alcoholic. Practically all were leading useful lives, although 30 per cent showed evidence of emotional disturbances.
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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