Aspergillosis is a chronic fungal infection of the air sacs, syrinx, lungs, and sometimes nasal cavity caused by Aspergillus fumigatus, and African Grey parrots are among the most heavily over-represented psittacine species. Affected birds present with progressive dyspnea, voice change, exercise intolerance, and weight loss over weeks to months. Survival improves dramatically with early diagnosis, prolonged antifungal therapy, and husbandry correction (AAV Basic Care for Companion Birds, 2019).
Last reviewed: June 2026
Why African Greys Are At Special Risk
Aspergillus fumigatus is everywhere — its spores are present in nearly all home environments. Healthy birds inhale spores constantly without disease. African Greys appear especially susceptible because of a combination of factors: incomplete or imbalanced diets low in vitamin A, indoor environments with poor air exchange and humidity extremes, chronic stress, and what appears to be species-level immune susceptibility. Hypovitaminosis A in particular damages the respiratory epithelium and allows spores to germinate and invade. As described in Carpenter's Exotic Animal Formulary, addressing nutrition is a critical part of both treatment and prevention.
What Aspergillosis Looks Like
The disease has acute and chronic forms. Chronic aspergillosis — the form most common in African Greys — develops insidiously over weeks. Owners notice voice change first: the bird's normal vocabulary becomes raspy, weak, or wheezy. Tail bobbing with each breath at rest, exercise intolerance during play, reduced talkativeness, and gradual weight loss follow. A characteristic open-mouth breathing pattern develops late. Acute aspergillosis presents with sudden respiratory distress, often in a previously stressed or recently moved bird, and carries a high mortality.
Diagnosis
Diagnosis is built from clinical signs, hematology, imaging, and direct visualization. A complete blood count typically shows leukocytosis with heterophilia and monocytosis. Plasma protein electrophoresis often reveals an elevated beta-globulin fraction. Whole-body radiographs may show air sac thickening, asymmetric air sac density, or focal granulomatous lesions, but normal radiographs do not rule out the disease. CT scan is far more sensitive. Aspergillus antigen testing (galactomannan ELISA) and Aspergillus-specific antibody titers add supporting evidence. The most definitive test is endoscopic exam of the air sacs with tissue biopsy and culture — fungal plaques are typically visible to the trained eye.
Antifungal Treatment Protocols
Treatment is long and multi-modal. Itraconazole or voriconazole orally for 3 to 12 months is the cornerstone — voriconazole has improved CNS and air-sac penetration and is increasingly first-line in African Greys, though it requires therapeutic drug monitoring because of high inter-individual variability. Nebulization with amphotericin B, F10SC disinfectant, or voriconazole solution twice daily is a powerful adjunct. Surgical or endoscopic debridement of focal granulomas where accessible improves outcomes substantially. Treatment courses below 8 to 12 weeks have high relapse rates, and treatment should never be truncated based solely on clinical improvement.
Husbandry Changes That Matter
No antifungal protocol succeeds without husbandry correction. Reduce environmental spore load by removing damp bedding, eliminating moldy seed or pellets, increasing room ventilation, and removing decaying organic material. Maintain ambient humidity at 40 to 60 percent. Companion bird basic care expectations — diet, ventilation, ambient temperature, and routine health monitoring — are detailed in current avian veterinary owner guidance (AAV Basic Care for Companion Birds, 2019). Switch to a balanced pelleted diet supplemented with dark leafy greens and orange-fleshed vegetables to address vitamin A deficiency. Avoid wood chip and corncob bedding which harbor Aspergillus. Stop using scented candles, air fresheners, and aerosolized cleaning sprays. Quarantine new birds.
Prognosis
Outcomes depend heavily on extent of disease at diagnosis and on owner persistence with prolonged antifungal therapy. Birds diagnosed with focal disease early have reasonable survival in published case series. Birds with extensive air sac involvement or syringeal granulomas obstructing the airway have a guarded prognosis. Reported mortality in clinically affected birds across published series ranges from 20 to over 50 percent depending on stage at presentation. Early aggressive intervention is the single biggest determinant of survival.
When to See a Vet
Call your vet today if:
- Voice change — your African Grey's vocabulary becomes raspy or weak
- Tail bobbing with each breath at rest
- Reduced flight, talking, or play tolerance
- Gradual weight loss over weeks
- Open-mouth breathing during stress or handling
Go to the ER immediately if:
- Sudden severe respiratory distress with open-mouth breathing
- Cyanotic (blue or purple) skin around the cere
- Collapse or inability to perch
- Bleeding from the mouth or choanal slit
- Acute progressive labored breathing in a previously normal bird
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Frequently Asked Questions
Can I catch aspergillosis from my parrot?
Aspergillus is everywhere in the environment, and humans inhale spores daily. Healthy immunocompetent people are not at meaningful risk from a sick bird. Immunocompromised individuals — recent organ transplant recipients, people on chemotherapy, people with advanced HIV — should discuss any sick household bird with their own physician. The risk is from environmental exposure rather than bird-to-human transmission.
How much does aspergillosis workup and treatment cost?
Initial avian vet exam typically runs $100 to $300, since avian exams price about 1.5 to 2 times standard. CBC, biochemistry, and protein electrophoresis add $200 to $500. Radiographs are $200 to $400; CT $1,000 to $2,500; endoscopy $800 to $1,800. Itraconazole or voriconazole for 6 to 12 months runs $200 to $900 depending on dose and drug. Nebulization equipment is $80 to $200 one-time, plus $50 to $200 monthly for nebulizer drug solutions. Hospitalization for acute respiratory distress runs $400 to $1,200 per day. Pellet conversion and improved husbandry are inexpensive but high-impact.
Will my parrot's voice come back?
Often partially. Voice change reflects syringeal inflammation, granulomas, or air-sac infection. With successful antifungal treatment, many birds regain meaningful vocalization over months. Birds with severe syringeal damage or surgical debridement of syringeal granulomas may have permanently altered voices despite cure of the infection.
Can aspergillosis come back after treatment?
Yes — relapse is well documented, particularly when antifungal therapy is shortened, when underlying husbandry issues are not corrected, or when underlying immune compromise persists. Annual followup with imaging or galactomannan testing is reasonable in birds with confirmed prior aspergillosis. Many birds need lifelong vigilance even after clinical cure.
Are seeds really worse than pellets for my African Grey?
Yes, for most pet African Greys. Seed-based diets are low in vitamin A and several other micronutrients linked to respiratory epithelial integrity. Hypovitaminosis A is one of the most consistently identified risk factors for aspergillosis in seed-fed parrots. Conversion to a balanced pelleted diet, while challenging in adult birds, substantially reduces respiratory disease risk over time.
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