(A) Epidemiology and Symptoms The disease occurs mainly in chickens, and other poultry are not infected. Chicks of about two months of age are the most common. Most of the disease occurred in the cold and humid season of autumn and winter. The sudden change in temperature and overcrowding of chickens are the precipitating factors causing the epidemic. The diseased chicken has a swollen face, runny nose, inflammation of the conjunctiva, and sneezing. As the disease progresses, the nasal secretions become thick and smelly. The diseased chicken often shakes his head and scratches his nose with a claw. After the mucus dries, he forms a scab around the nostrils. When the inflammation spreads to the trachea, breathing difficulties are seen. (B) pathological changes mainly in the upper respiratory tract, the edge of the mucous and catarrhal inflammation, exudate sinusoids clot, after becoming caseous necrosis, and sometimes can be found in the lung and in the airway inflammation. (c) Diagnostic pathological changes have no obvious features, and are similar to other respiratory diseases, chronic fowl cholera, fowlpox, and vitamin deficiency, causing problems for clinical diagnosis. When the diagnosis is made, it is best to perform laboratory tests in addition to the condition of the flock and age. China Agricultural Network Editor
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