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Social Disease Derived: 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.
Prominent among concepts of rheumatic fever is its reputation as a social disease derived from its high incidence among underprivileged children who are exposed to substandard living conditions in the poorer urban districts. Although it can occur in the most privileged homes, its tendency to flourish among children subjected to poor living conditions remains proverbial. This has been ascribed to crowding, unusually heavy exposure to streptococci, malnutrition, or to various combinations of such circumstances.
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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