The most common form of air sac inflammation is caused by e.coli infection clinically. Symptoms of sick chickens include depression, difficulty breathing, abdominal respiration accompanied by snoring , coughing and tweeting. The air sac was found to be turbid by autopsy, with a large amount of turbid exudate,in severe cases,the air sac wall was thickened with cheese-like clots of varying sizes.
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