Pythiosis in cat (Feline Pythiosis)

Common info

Pythiosis Feline (Water mold infection) is the cause of fungal infection or water mold infection. This water mold is called Pythium insidiosum, a class member of Oomycota. It’s the cause of diseases and can travel in water. It usually enters the body through sinuses, esophagus, or skin. It’s also the cause of infections in the lung, brain, sinus, and skin. On an infected area, there might be tumors under or on the skin.


This water mold can be found in a swamp or stagnant water throughout the southern United States. It is also called “swamp cancer” The symptoms often occur during the fall season or at the beginning of winter. It can also grow in tropical and subtropical waters such as ponds, swamps, wetlands, and lakes, it can be found to occur as far west as central California.


Pythiosis Feline (Water mold infection) occurs from contacting with a water mold called Pythium insidiosum through swallowing or breathing in mold-contaminated water into the respiratory system which is the cause of infection.


  • Headache
  • Fever
  • Cough
  • Swollen Nose
  • Digestive system infection 

Symptoms in cats such as feverish, coughing, regurgitate. If having a respiratory system infection, it will cause an enlarged abdomen and intestine.

Treatment and Prevention

The treatment for Pythiosis Feline (Water mold infection) is often by removing the tissues or prescribe them with antifungal medicines. If cats who any symptoms, they should be taken to the hospital immediately for further treatment.


  1. PetCoach | Pythiosis (Fungal Infection) in Cats
  2. PET MD | Water Mold Infection (Pythiosis) in Cats
  3. PET MD | Water Mold Infection (Pythiosis) in Dogs
  4. VCA | Pythiosis in Dogs
  5. N.A. Berryessa, S.L. Marks, P.A. Pesavento, T. Krasnansky, S.K. Yoshimoto, E.G. Johnson, and A.M. Grooters. 2008. Gastrointestinal Pythiosis in 10 Dogs from California. Journal of Veterinary Internal Medicine. 22:1065–1069.
  6. Pauline M. Rakich1, Amy M. Grooters and Kai-Ning Tang. 2005. Gastrointestinal pythiosis in two cats. Journal of Veterinary Internal. 17:262–269.
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