Chickens are most likely to cause this disease within 8 to 22 weeks of age. Young chickens generally show acute high deaths with a mortality rate of around 45%. Laying hens and breeders are generally chronically passed.
The main symptoms of sick chickens are:
The most acute type
In the early stage of the disease, the chicken suddenly became uneasy, struggling to fall, and then died. Or the spirit and appetite were normal when entering the circle the night before, and died in the chicken house the next day. The course of illness was several hours.
2. Acute type
Most of the sick chickens have acute symptoms, and the sick chickens are depressed, lethargic, neck-necked, feathery, bow-necked, loss of appetite or lack of food. Frequent diarrhea, the stool is grayish yellow and blackish green. The cockscomb meat is purple, breathing is difficult, and finally coma and death, the course of disease is generally 1 to 3 days.
3. Chronic type
More common in the late stage of the epidemic, chronic pneumonia, chronic respiratory tract inflammation and chronic gastroenteritis are more common. Some chickens have significant swelling on one or both sides of the meat. Subsequently, there may be purulent, cheese-like substances or necrosis and necrosis. In some cases, the joints of the chickens are swollen, painful, and the toes are paralyzed, and the course of the disease can be delayed. For more than a month, growth and production and egg production cannot be recovered for a long time. Sometimes the diseased chicken develops arthritis or spasm and cannot walk. When treated with antibiotics or sulfa drugs, the mortality rate drops significantly, but it relapses after stopping the drug.
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