(I) Epidemic features and symptoms The density of chickens is too high, and poor environmental hygiene and nutritional imbalance are likely to induce the disease. Young chicken and broiler chickens are susceptible. Loss of appetite in sick chickens, faeces are dark black, and sometimes mixed with blood, the disease develops rapidly in the flock and can continue for 26 days without treatment. (B) pathological changes in the small intestine thickening, thickening of the intestine, large intestine under the serosal hemorrhage or plaque, intestinal mucosal necrosis, the content was brown, and sometimes full of gas in the intestine. Sometimes there is a circular necrotic area on the liver. (c) diagnosis based on pathological changes can make a preliminary diagnosis. To further confirm the diagnosis, Gram-stained smears of intestinal mucosa or contents should be taken for microscopic examination. (d) prevention and control usually pay attention to the health of chicken coops, try to reduce stress factors, after the onset of the use of tetracycline, streptomycin, penicillin or sulfamethazine treatment effect is obvious. China Agricultural Network Editor
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