Aspergillosis
Learn what the condition is, how it may be detected early, how it is treated or managed, and which breeds or species are linked to it.
Condition snapshot
A concise guide to the condition’s pattern, detection, management and urgency.
Emergency presentation is possibleVoice loss, acute obstruction or severe breathing difficulty requires emergency airway assessment.
This snapshot is a general guide, not a diagnosis or treatment plan. New, severe or worsening signs require veterinary assessment.
About the condition
Aspergillosis is infection by Aspergillus fungi, most often A. fumigatus, after inhaled spores germinate and invade respiratory tissue. Spores are ubiquitous, so disease generally reflects heavy exposure or impaired defence rather than direct transmission from another bird. Mouldy feed or bedding, dusty poor ventilation, malnutrition, prolonged corticosteroids, aspiration, chronic illness and stress increase risk. African greys, Amazons, macaws, raptors and some aquatic birds are over-represented.
Acute exposure can cause rapid diffuse pneumonia or air-sac disease, particularly in young or heavily exposed birds. Chronic infection forms plaques and granulomas in air sacs, lungs, trachea, syrinx or sinuses. Voice change, exercise intolerance, tail bobbing, open-mouth breathing, weight loss and reduced appetite are common. A tracheal or syringeal granuloma can obstruct airflow suddenly. Dissemination may involve liver, kidney, bone, skin, eye or brain.
Finding environmental Aspergillus or a positive antibody result does not prove tissue invasion. Bacterial airsacculitis, other fungi, tumour and inhaled foreign material overlap. Culture can be negative despite cytological hyphae, while positive culture from a non-sterile site may represent contamination.
Treatment is prolonged because avian air sacs have limited blood supply and granulomas shield organisms. Prognosis depends on location, burden and correction of immune or environmental factors; focal accessible disease can do well, whereas disseminated infection is guarded. Aspergillosis is not managed by flock antibiotics or casual mould cleaning alone. Prevention uses dry correctly stored feed, good ventilation, clean brooders and avoidance of immunosuppressive medication without indication. Aspergillus spores are common in the environment, but disease develops when heavy exposure or impaired defences allow fungal growth in air sacs, lungs or other tissues. Poor ventilation, mouldy litter or feed, chronic illness and corticosteroid exposure increase risk. Granulomas can obstruct airways or invade bone and organs.
Screening & Early Detection
Observe respiratory rate, voice and effort before restraint, then record weight and pectoral muscle. Complete blood count may show leukocytosis, monocytosis or anaemia, while chemistry assesses dissemination and treatment safety. Radiographs can reveal airsacculitis, granulomas or organ change; CT detects subtler distribution and helps plan endoscopy.
Endoscopic visualisation with biopsy, cytology and fungal culture provides the strongest evidence of tissue invasion. PCR and antigen or antibody tests support selected cases but false-positive and false-negative results occur, especially in immunocompromised birds. Results are integrated rather than used alone.
Feed, litter, ventilation, humidity, steroid exposure and concurrent disease are reviewed. A bird with voice loss or acute obstruction needs urgent airway assessment; restraint can be fatal in severe dyspnoea. During therapy, weight, respiratory function, blood counts, organ values and repeat imaging or endoscopy track response. Environmental spore counts are not a substitute for examining the patient. Diagnosis usually combines imaging, endoscopy and targeted cytology, histology or fungal culture. Antibody or antigen assays may add evidence but are not definitive in every species. A normal superficial swab does not exclude deep air-sac disease, and unstable birds may need oxygen before invasive procedures.
Treatment & Management
Stabilise respiratory distress with oxygen, warmth and minimal handling. A tracheal or syringeal obstruction may require emergency air-sac cannulation and endoscopic removal. Focal sinus or air-sac granulomas often need surgical debridement because systemic drug penetration is poor.
Systemic antifungal choice—such as itraconazole, voriconazole or amphotericin B—depends on species, site, severity and susceptibility. Some species tolerate particular azoles poorly, and liver or kidney values are monitored. Nebulised or locally delivered therapy may supplement, not automatically replace, systemic treatment. Antibacterials address only proven secondary infection.
Provide fluids and high-quality nutrition, correct vitamin A deficiency or other immunosuppression, stop inappropriate corticosteroids and remove mouldy feed or damp substrate. Treatment commonly lasts weeks to months and continues beyond obvious improvement until objective lesions regress. Recheck imaging or endoscopy where warranted. Relapse can follow incomplete therapy or uncorrected exposure. Prognosis is guarded for disseminated disease, neurological involvement or persistent obstruction. Contacts do not require antifungal medication solely because they shared air, but their environment and underlying health are assessed for the same exposure. Antifungal choice and duration depend on species, lesion site and susceptibility; itraconazole is poorly tolerated by some African grey parrots. Endoscopic removal or local treatment of granulomas may be necessary. Environmental mould sources, ventilation and underlying immune or nutritional problems must be corrected to reduce recurrence.
Breeds or species affected
Adelaide Rosella
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Bar-shouldered Dove
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Blue-faced Parrot Finch
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Bourke's Parrot
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Brown Quail
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Budgerigar
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Cockatiel
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Common Bronzewing
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Crested Pigeon
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Diamond Dove
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Eastern Rosella
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Elegant Parrot
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Emerald Dove
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Galah
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Gouldian Finch
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Hooded Parrot
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King Quail
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Little Button-quail
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Little Corella
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Long-billed Corella
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Musk Lorikeet
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Painted Button-quail
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Painted Finch
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Pale-headed Rosella
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Peaceful Dove
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Port Lincoln Parrot
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Princess Parrot
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Rainbow Lorikeet
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Red-capped Parrot
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Red-collared Lorikeet
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Red-rumped Parrot
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Scaly-breasted Lorikeet
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Scarlet-chested Parrot
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Star Finch
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Stubble Quail
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Sulphur-crested Cockatoo
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Twenty-eight Parrot
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Western Corella
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Western Rosella
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Yellow Rosella
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Zebra Finch
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Canary
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Society Finch
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Domestic Pigeon
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Indian Ringneck Parakeet
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Alexandrine Parakeet
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Peach-faced Lovebird
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Fischer's Lovebird
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Sun Conure
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Jenday Conure
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