Feline Protozoan Diarrhea
Protozoan Diarrhea is classified as a group of diseases caused by several, one-cell organisms that include Giardia, Trichomonas, and Coccidia.
These organisms may normally be found in the intestine in very small numbers, but multiply greatly in an intestinal tract irritated by other problems, such as internal parasites (worms), diet changes, viral infections and stress.
These organisms are visible only under the microscope, and are entirely different from “worms,” and therefore cannot be treated with "deworming" medications.
These diseases may spread from one animal to another by contact with feces (stools) from infected individuals.
Symptoms Of Protozoan Diarrhea:
Protozoan diarrhea is much more severe in younger or weakened animals.
It causes a “mushy” or “watery” type of diarrhea. Sometimes vomiting is also seen with this disease. Your cat may become anorectic (not eat), may be sluggish or lethargic, and may become dehydrated.
Often, these diseases weaken a cat, making it more susceptible to other diseases.
Diagnosis Of Protozoan Diarrhea:
Diagnosis is by microscopic examination of the feces (stools).
A physical examination performed by your cat's veterinarian will be necessary to assess your cat's over-all condition.
Routine blood screens and fecal analysis for other types of parasites may also be necessary.
Treatment Of Protozoan Diarrhea:
Treatment will vary depending on your cat's condition. The following suggestions may help:
- Have your cat examined by his/her veterinarian. Provide a sample of your cat's stool for your veterinarian to examine as well. Give any medications prescribed by your cat's veterinarian as directed. Medications may include anti-emetics to control vomiting and anti-diarrheal medications, as well as drugs specific to the individual organism diagnosed.
- Keep the bedding and cage area clean, dry and free of bowel movements.
- Feed a high quality balanced diet. Be sure your cat eats!
- Encourage oral liquids. Your cat’s body is 80% water. Dehydration can occur very quickly from vomiting and/or diarrhea. Failure to orally consume enough water each day also leads to dehydration. Fluids are essential in the treatment of this disease. If your cat becomes dehydrated, fluid replacement therapy may need be initiated by your cat's veterinarian.
- Good sanitation is a must! Keep infected animals away from non-infected animals.
- Isolate infected animals to prevent spreading the disease.
Giardia is contagious to humans, so precautions should be taken in caring for your cat and handling any body wastes. Wear gloves when handling feces and make certain to wash your hands thoroughly after handling your cat.

