Aspergillosis in Crested Geckos: Fungal Respiratory Infection Overview
- See your vet immediately if your crested gecko has open-mouth breathing, wheezing, mucus around the nose or mouth, or is struggling to breathe.
- Aspergillosis is a fungal infection caused by Aspergillus species. In reptiles, it most often affects the respiratory tract and can spread if the gecko is already stressed or immunocompromised.
- Poor husbandry, chronic stress, low temperatures, excess humidity, poor sanitation, malnutrition, and other illness can increase risk.
- Diagnosis may involve a physical exam, husbandry review, radiographs, cytology or culture, and sometimes advanced imaging or endoscopy.
- Treatment usually combines environmental correction, supportive care, and antifungal medication chosen by your vet. Recovery can be prolonged, and prognosis is guarded in severe cases.
What Is Aspergillosis in Crested Geckos?
See your vet immediately if your crested gecko is having trouble breathing. Aspergillosis is a fungal disease caused by Aspergillus species. In reptiles, fungal disease commonly affects the respiratory tract, and Merck notes that the skin and respiratory tract are among the most frequent sites of fungal infection. PetMD also lists Aspergillus among fungal causes of respiratory disease in reptiles.
In a crested gecko, aspergillosis usually starts after fungal spores are inhaled into an already vulnerable respiratory system. That vulnerability often comes from stress, poor enclosure conditions, malnutrition, or another illness. While some cases stay centered in the lungs and airways, fungal infections in reptiles can become more widespread and much harder to manage.
This is not a condition to monitor at home for several days. Crested geckos often hide illness until they are quite sick, so subtle breathing changes, reduced appetite, or unusual lethargy deserve prompt veterinary attention.
Symptoms of Aspergillosis in Crested Geckos
- Open-mouth breathing
- Increased breathing effort or visible flank movement
- Wheezing, clicking, or other abnormal breathing sounds
- Nasal discharge or mucus around the nostrils or mouth
- Lethargy or weakness
- Reduced appetite and weight loss
- Poor body condition or dehydration
Respiratory disease in reptiles can worsen quickly, and fungal infections may be advanced before obvious signs appear. Mild appetite loss plus subtle breathing changes can still be serious in a crested gecko.
See your vet immediately for open-mouth breathing, marked effort to breathe, collapse, or severe weakness. If signs are milder, such as decreased appetite, quiet wheezing, or reduced activity, schedule a reptile-experienced veterinary visit as soon as possible rather than waiting to see if it passes.
What Causes Aspergillosis in Crested Geckos?
Aspergillosis is caused by fungi in the Aspergillus group, but exposure alone does not always lead to disease. PetMD notes that fungal respiratory infections in reptiles often take advantage of underlying disease, weakness, malnutrition, and poor husbandry. Merck also describes antifungal treatment as challenging in reptiles, especially when infection has spread beyond one area.
Common risk factors include enclosure temperatures that are too low, chronically damp or dirty conditions, poor ventilation, high stress, overcrowding, recent transport, and inadequate nutrition. Older or debilitated geckos may be at higher risk, as are animals already dealing with parasites, bacterial infection, or other chronic illness.
For crested geckos specifically, problems often develop when humidity and ventilation are out of balance. They need humidity cycling, not a constantly wet enclosure. Persistently soggy substrate, mold growth, dirty decor, and poor airflow can all increase the chance that fungal spores build up in the environment.
How Is Aspergillosis in Crested Geckos Diagnosed?
Your vet will start with a careful history and physical exam, including questions about humidity, temperature gradients, substrate, cleaning routine, appetite, weight trends, and any recent stressors. Because many reptile respiratory diseases look similar at first, diagnosis usually focuses on confirming that a fungal infection is present and ruling out bacterial, parasitic, viral, husbandry-related, or structural causes.
PetMD notes that reptile respiratory workups commonly include radiographs to look for changes in the lungs and airways. Depending on the case, your vet may also recommend cytology, fungal culture, PCR or other lab testing, bloodwork if feasible, or sampling material from the respiratory tract. In more complex cases, advanced imaging or endoscopy may be discussed through an exotics or specialty service.
A confirmed diagnosis can take time. That is one reason early evaluation matters. Starting supportive care, correcting husbandry problems, and building a practical treatment plan with your vet can begin while test results are pending.
Treatment Options for Aspergillosis in Crested Geckos
Spectrum of Care means you have options. Here are treatment tiers at different price points.
Budget-Conscious Care
- Exotic pet exam
- Focused husbandry review and enclosure corrections
- Weight check and hydration assessment
- Basic supportive care plan
- Empirical antifungal discussion if your vet feels it is appropriate
- Short-term follow-up
Recommended Standard Treatment
- Exotic pet exam and detailed husbandry assessment
- Radiographs
- Cytology and/or fungal or bacterial sampling when feasible
- Targeted antifungal medication selected by your vet
- Supportive care such as fluids, nutritional support, and temperature optimization
- Scheduled rechecks to monitor breathing, appetite, and weight
Advanced / Critical Care
- Emergency or specialty exotics evaluation
- Hospitalization and oxygen or intensive supportive care if needed
- Advanced imaging or endoscopy when available
- More extensive fungal testing and culture
- Injectable or compounded medication planning
- Repeated imaging and longer-term monitoring
Cost estimates as of 2026-03. Actual costs vary by location, clinic, and individual case.
Questions to Ask Your Vet About Aspergillosis in Crested Geckos
Bring these questions to your vet appointment to get the most out of your visit.
- Based on my gecko's exam, how concerned are you that this is fungal rather than bacterial or husbandry-related?
- Which diagnostics would give the most useful answers first, and which ones can wait if I need to manage the cost range?
- Are there enclosure temperature, humidity, or ventilation changes I should make right away?
- What signs mean my gecko needs emergency re-evaluation, even if treatment has already started?
- What antifungal options are reasonable for this case, and what side effects should I watch for at home?
- How often should we recheck weight, breathing effort, and response to treatment?
- Could another condition, such as parasites or a bacterial infection, be contributing to the breathing signs?
- What is the realistic prognosis for my gecko with the treatment plan we are choosing?
How to Prevent Aspergillosis in Crested Geckos
Prevention starts with husbandry that supports the immune system and keeps fungal growth in check. PetMD recommends good sanitation and a well-balanced diet to reduce fungal disease risk in reptiles. For crested geckos, that means appropriate temperature ranges, humidity that rises and falls rather than staying constantly wet, clean water, regular waste removal, and good airflow.
Avoid overcrowding and quarantine new reptiles before introducing them to the same room or equipment. PetMD advises quarantine for new reptiles in respiratory disease prevention, often for several months based on veterinary guidance. Shared decor, feeding tools, and handling between animals can also spread pathogens or increase stress.
Routine weight checks, careful observation of appetite and activity, and prompt veterinary care for subtle breathing changes can make a big difference. A crested gecko that is eating well, maintaining body condition, and living in a clean, well-managed enclosure is less likely to develop opportunistic fungal disease.