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The Disease Begins: 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.
Characteristics.—The incubation period, or the time from the bite of the animal to the appearance of the illness in man, is prolonged, being rarely less than 15 days. The incubation period is usually shorter after wounds to the head and face. The disease begins with a few days of fever, headache, lassitude, nausea, and poor appetite. One of the earliest symptoms suggesting the disease is pain or other sensations at the site of the wound. This is followed by increasing anxiety, apprehension, and then excitation. During this stage, convulsions commonly occur.
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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