This is from the aspergillosis section of the AAAP Avian Disease Manual:
CLINICAL SIGNS
1. Dyspnea, gasping, cyanosis and accelerated, labored breathing frequently are observed. Rales do not usually accompany these respiratory diseases. Other signs include diarrhea, anorexia, somnolence, progressive emaciation, dehydration and increased thirst.
2. Morbidity is variable. Mortality is high in clinically affected birds. Increased mortality will be noted in affected flocks during loadout, hauling and following insemination. Affected birds often die during or just after handling especially if held by their legs.
3. Signs of central nervous system disturbance may occur in a small percentage are of the birds if there has been spread to the brain. Signs often include ataxia, falling, pushing over backwards, opisthotonos, paralysis, etc.
4. A gray-white opacity may develop in one or both eyes when there is eye infection. Ocular discharge occurs when the conjunctiva is infected and there can be corneal ulceration. A large mass of exudate typically accumulates in the medial canthus under the third eyelid.
-Kathy