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My cat was exposed to mold. What health symptoms should I watch for?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 11 years and 3 months old | 10 lbs

My cats have been exposed to Aspergillus & Penicillium in our home for 3 months. We found out only recently, when it sent us (humans) to the ER & are moving this week. They show some symptoms of aspergillosis, fungal toxicity, etc. but vet we saw dismissed them as symptoms of anxiety. Questions: 1. What health issues could the exposure cause? 2. What tests should be conducted? 3. Is 3 months considered long term/serious? Our cats are otherwise pretty healthy. 4. What can I lookout for? Thanks!

1 Answer

Most Helpful Answer

Sara Farmer, DVM

Answered By Sara Farmer, DVM

Veterinarian

Published on July 17th, 2018

Cats are pretty resistant to aspergillosis so you probably don’t have to worry. Nasal aspergillosis causes nasal discharge, enlarged lymph nodes and lethargy/decreased appetite. Systemic aspergillosis really only occurs in immunocompromised cats so if your cats are healthy there is minimal concern. Systemic/disseminated aspergillosis causes decreased appetite, lethargy, GI signs, and fever. Cats are typically very sick with either form.

Aspergillosis is everywhere in the environment so 3 months of potential exposure wouldn’t be too concerning - they may be exposed again at some point. Testing is difficult for the same reason and ultimately a CT scan, scoping and biopsy is usually needed for diagnosis.

I would simply watch for thick nasal discharge and contact your vet if noted.
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