Fungal Infection (Aspergillosis) in Cats

Aspergillosis is a sneaky fungal infection caused by Aspergillus, a common mold found in various environments, such as dust, straw, grass clippings, and hay. This opportunistic infection occurs when a normally harmless organism becomes infectious, taking advantage of a weakened immune system. While any cat can be affected, Persians have a slightly higher incidence. Let’s delve into this condition and its impact on our feline friends.

Understanding Aspergillosis in Cats

Types of Infection and Symptoms

There are two types of Aspergillus infections: nasal and disseminated. The nasal form occurs when the fungus enters the nasal passages and front sinuses. Cats who come into contact with dust and grass clippings outdoors are at a higher risk. Symptoms commonly associated with nasal aspergillosis include nasal discharge and noisy breathing during inhalation.

The disseminated form, on the other hand, spreads throughout the body and is not confined to the nasal area. The exact route of entry for this type is still unknown. Disseminated aspergillosis is often characterized by nonspecific signs like lethargy, depression, vomiting, diarrhea, and even protruding eyeballs.

Causes and Risk Factors

Aspergillus fungus is present in dust, hay, and grass, making it easily accessible to cats. However, it primarily affects cats with weakened immune systems. Those with immunodeficiency or underlying illnesses, such as diabetes or feline leukemia virus (FeLV), are more susceptible to this infection.

Diagnosis and Treatment

To diagnose nasal aspergillosis, veterinarians typically analyze nasal swabs, perform fungal cultures of nasal discharge, and conduct a rhinoscopy to examine the nose’s internal linings. Diagnosing disseminated aspergillosis is more challenging due to the nonspecific symptoms, but tests like urine analysis and X-rays can aid the process.

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Treating aspergillosis often involves administering antifungal drugs directly into the nose or nasal passage. It’s crucial to complete the full course of medication to prevent symptom recurrence. Regular monitoring is essential, with cats undergoing urine analysis and X-rays every one to two months, depending on the severity.

Ensuring a Healthy and Safe Environment

Preventing aspergillosis involves maintaining your cat’s overall health and bolstering their immune system. A balanced diet and regular physical activity play significant roles in achieving this. Additionally, keeping your cat indoors can limit their exposure to grass clippings, hay, straw, and other Aspergillus-friendly substances.


Remember, a happy and healthy cat is less likely to fall victim to opportunistic diseases like aspergillosis. Stay vigilant, provide a safe environment, and always consult your veterinarian for the best care possible.