Cockatiel Aspergillosis: Respiratory Signs and Antifungal Treatment

Aspergillosis is a serious fungal infection caused by Aspergillus fumigatus that affects the respiratory tract of cockatiels and other birds. It is often slow to develop, initially mimicking minor respiratory illness, but can become life-threatening once established in the air sacs or lungs. Early diagnosis and long-term antifungal treatment are essential for a good outcome.

Last reviewed: June 2026

What Is Aspergillosis in Cockatiels?

Aspergillosis is caused by Aspergillus fumigatus, an environmental mold found in soil, decaying organic matter, dusty seed, and moldy food. Birds with a healthy immune system typically inhale small numbers of spores without becoming ill. Disease develops when a bird is exposed to an overwhelming spore load or has an immunocompromised state.

Risk factors in cockatiels include:

• Chronic stress (overcrowding, inappropriate diet, social isolation)
• Concurrent illnesses (especially viral diseases or chronic malnutrition)
• Corticosteroid use (suppresses immune function)
• Dusty seed diets with old or moldy seeds
• Poor cage hygiene — mold-contaminated substrate

Aspergillus primarily infects the air sacs, trachea, lungs, and syrinx (voice box). Advanced disease can spread to the liver, kidney, brain, and eyes. As described in Carpenter's Exotic Animal Formulary, voriconazole is now considered the first-line antifungal for avian aspergillosis because of its superior tissue penetration compared to older agents like itraconazole.

Signs of Aspergillosis in Cockatiels

Early (often overlooked):

• Mild breathing changes — slightly tail-bobbing with each breath
• Subtle voice change or quieter vocalization (syrinx involvement)
• Reduced activity, fluffed feathers

Moderate to advanced:

• Open-mouth breathing or labored respiration
• Tail-bobbing pronounced with every breath
• Clicking or wheezing sounds
• Nasal discharge (serous to mucopurulent)
• Weight loss despite eating, or reduced appetite
• Exercise intolerance — bird gasps after minimal movement

Systemic aspergillosis:

• Neurological signs (ataxia, head tilt) if brain is involved
• Diarrhea, polyuria, or yellow-green urates (liver/kidney involvement)
• Sudden death in severely immunocompromised birds

Diagnosis requires a combination: CBC (elevated WBC, heterophilia), serum protein electrophoresis (elevated beta-globulins), endoscopy (to visualize granulomas in air sacs), culture/PCR of tracheal wash samples, and often CT imaging. A single negative test does not rule out aspergillosis.

Treatment

Voriconazole (12–18 mg/kg twice daily in cockatiels) is the current first-line treatment. Treatment courses are typically 4–6 weeks minimum; established air sac granulomas may require 3–6 months of treatment. As described in Carpenter's Exotic Animal Formulary, blood glucose monitoring is recommended in cockatiels on voriconazole, as hypoglycemia has been reported in small psittacines.

Nebulization with voriconazole or amphotericin B directly delivers antifungal medication to the respiratory tract — used as an adjunct to systemic therapy.

Surgical debridement of large air-sac granulomas by an avian surgeon may be necessary in advanced cases.

Supportive care: Correct any nutritional deficiencies (vitamin A deficiency is a significant predisposing factor — ensure the diet includes fresh dark leafy greens and orange vegetables, not only seeds). Reduce all stress factors.

According to the AAV Basic Care for Companion Birds, 2019, a seed-only diet is the single most significant husbandry risk factor for aspergillosis in cockatiels because it creates vitamin A and other micronutrient deficiencies that impair mucosal immunity.

When to See a Vet

Call your vet today if:

• Your cockatiel is breathing with visible tail-bobbing at rest
• Vocalization has changed — quieter, hoarser, or absent
• Your bird is fluffed, sitting low on the perch, or barely active
• You notice your cockatiel has lost noticeable weight or muscle mass

Go to the ER immediately if:

• Your cockatiel is breathing with an open beak
• You can hear clicking, wheezing, or crackling when the bird breathes
• Your bird is on the cage floor, cannot perch, or is unresponsive
• Your cockatiel tilts its head, circles, or has a seizure

Frequently Asked Questions

How much does treating aspergillosis in cockatiels cost? An avian vet visit runs $80–150. Diagnostic workup — CBC, protein electrophoresis, tracheal wash, culture, possible CT imaging — can cost $400–1,000. Voriconazole is expensive: a long treatment course runs $100–300 per month depending on dose and compounded formulation. Total first-episode cost including diagnostics and 3 months of medication is commonly $800–2,500.

Can aspergillosis in cockatiels be cured? Early, localized aspergillosis has a reasonable prognosis with prolonged antifungal treatment. Disseminated aspergillosis (spread to multiple organs) or cases with large established granulomas carry a guarded to poor prognosis. Prognosis correlates strongly with how early treatment begins and the bird's immune status.

Is aspergillosis in cockatiels contagious to other birds? Aspergillosis is not directly contagious bird to bird — it is an environmental infection, not a transmitted disease. However, if one bird in a group develops aspergillosis, it suggests the environment has high spore loads. Check for mold, improve ventilation, and clean cage thoroughly. Other birds in the same environment may be at elevated risk.

What can I do to prevent aspergillosis in my cockatiel? Feed a varied diet rich in vitamin A (cooked sweet potato, dark leafy greens, carrots alongside a quality pellet base). Replace seed mixes every 1–2 weeks; discard any moldy-smelling portions. Keep the cage clean and dry, ensure good ventilation, and minimize chronic stress. An avian wellness exam annually helps detect early signs.

How long does aspergillosis treatment take? Minimum 4–6 weeks for mild cases; 3–6 months for established air-sac disease. Antifungal therapy is continued until all imaging, endoscopy, and laboratory values are normal. Stopping too early is the most common cause of relapse.

Still Not Sure if Your Cockatiel Needs a Vet?

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