Aspergillosis is a fungal lung and air-sac disease caused by Aspergillus species — most often Aspergillus fumigatus. It is one of the most common causes of chronic respiratory disease in pet parrots, especially African greys, Amazons, macaws, and cockatoos. Signs are slow and subtle: voice change, weight loss, exercise intolerance, and tail bobbing with breathing. Acute disease in young birds carries high mortality without prompt treatment (AAV Basic Care for Companion Birds, 2019).
Last reviewed: May 2026
What Aspergillosis Actually Is
Aspergillus species are environmental molds present in soil, decomposing plant matter, and damp bedding. Birds inhale the spores constantly; a healthy immune system handles them. When the bird is stressed, immunosuppressed, malnourished (especially vitamin A-deficient seed diets), or housed in damp moldy conditions, the spores germinate in the respiratory tract and form characteristic plaques in the trachea, syrinx, lungs, and air sacs. The disease has two forms: acute (rapid, often fatal in young or recently stressed birds) and chronic (slow, progressive, often months of vague symptoms in adult parrots).
Signs of Chronic Aspergillosis
The chronic form is the version owners learn to recognize. Early signs are subtle: a quieter bird, less talking, occasional voice changes (squeaky, raspy, or weak vocalizations), gradual weight loss despite normal appetite, increased respiratory effort with exertion, and a slightly tail-bobbing breathing pattern at rest. As the disease progresses, owners notice open-mouth breathing, audible respiratory sounds, intermittent green droppings (liver involvement), depression, and reduced interaction. Carpenter Exotic Animal Formulary covers the wide range of presentations and notes that voice change in a parrot should always trigger respiratory workup.
Why African Greys Are Especially Affected
African grey parrots have a known predisposition to aspergillosis — partly because of dietary calcium and vitamin A issues common in pet greys and partly because of an inherent susceptibility that is still being characterized. Other high-risk species include Amazons, macaws, cockatoos, and young recently weaned chicks. Nutritional support is part of prevention; the WSAVA Global Nutrition Guidelines, 2011 emphasize species-appropriate diets, which in parrots means a pelleted base rather than seed-only feeding.
How Vets Diagnose Aspergillosis
Diagnosis can be difficult — fungal cultures of swabs are unreliable and serology has limited specificity. The workup typically includes CBC and serum chemistry (high white count with monocytosis and elevated total protein/globulin support fungal disease), chest x-rays or CT (looking for air sac thickening, lung densities, or focal granulomas), endoscopy of the air sacs (the most definitive test — direct visualization plus biopsy), and fungal antibody/antigen testing. The AAV Basic Care for Companion Birds, 2019 emphasize that any bird with chronic respiratory signs and globulin elevations should have aspergillosis on the differential list.
Treatment That Actually Works
Treatment is long, expensive, and not always successful. The cornerstone is systemic antifungal therapy — itraconazole, voriconazole, or terbinafine — for 2 to 6 months, often combined with nebulization (amphotericin B, F10, or clotrimazole) directly into the airways. Surgical removal or endoscopic debridement of focal lesions in the syrinx or air sacs can improve survival. Supportive care: warm clean housing, balanced pelleted diet (not seed only), syringe feeding if needed, fluid support, and dust-free environment. Even with full treatment, mortality is significant in advanced cases — early detection makes the biggest difference.
When to See a Vet
Call your vet today if:
- A parrot whose voice has changed (raspier, weaker, or quieter)
- Tail bobbing while breathing at rest
- Gradual weight loss despite normal-looking appetite
- Decreased exercise tolerance — short flights or climbs followed by panting
- Persistent green droppings or reduced overall activity
Go to the ER immediately if:
- Open-mouth breathing or severe respiratory distress
- A bird sitting on the cage floor or unable to perch
- Sudden collapse, weakness, or seizures
- Cyanotic (blue-tinged) cere or beak
- Severe lethargy with refusal to eat for more than 24 hours
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Frequently Asked Questions
How much does aspergillosis treatment cost?
A first visit with avian exam, bloodwork, x-rays, and a starter antifungal often runs $400 to $900. Endoscopic confirmation under anesthesia adds $700 to $1,800. A 2 to 6 month course of itraconazole or voriconazole with nebulization treatments and rechecks usually totals $2,000 to $6,000. Severely affected birds needing hospitalization, oxygen, and intensive supportive care can exceed $8,000. Recheck imaging at 1 to 2 month intervals is part of monitoring.
Where do parrots pick up aspergillosis?
Spores are everywhere — in soil, mulch, moldy bird seed, damp bedding, neglected cage corners, and humid bathrooms. The classic risk environment is a stressed, malnourished bird in damp poorly ventilated housing. Reducing exposure means clean dry housing, frequent food and water changes, avoiding damp basements, controlling household dust, and never offering moldy seed or food.
Can I catch aspergillosis from my parrot?
Direct bird-to-human transmission is essentially nonexistent in healthy people. The same spores that infect the bird are present in the general environment, so the bird is a casualty of the spores, not a source. Immunocompromised people (transplant recipients, advanced AIDS) should minimize exposure to bird droppings and damp cage materials as a general precaution, but this is a precaution about the environment, not the bird.
Will my bird recover with treatment?
Outcomes depend on how early the disease is caught and the bird's overall condition at diagnosis. Mild chronic cases caught early often respond well to 2 to 4 months of antifungal therapy with good long-term outcomes. Severe acute aspergillosis or chronic disease with extensive air-sac granulomas has a guarded to grave prognosis even with aggressive treatment. Many birds need ongoing low-dose antifungal "maintenance" for months to years after the initial course.
Is seed-only diet really part of the problem?
Yes, often. Seed-only diets are typically low in vitamin A and calcium and high in fat, which together set up the immune dysfunction and respiratory-tract changes that allow Aspergillus to take hold. Transitioning a bird to a balanced pelleted base diet (with controlled fresh foods) over a few months is a major preventive intervention. Many avian vets consider it nearly as important as the antifungal medication itself.
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