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| 1. Newcastle Disease (ND) |
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| 1) A number of dead chickens seen in an outbreak of ND. | 2) Nervous signs, such as paralysis of legs and wings, twisting of head and neck, etc. |
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| 3) Hyperemia and edema on mucous membrane of the trachea. | 4) Hemorrhages and ulcers of proventricular mucosa. |
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