Despite relative high rates of prevalence of this parasite in the gastrointestinal microbiota of dogs, they are normally an opportunistic parasite associated with concurrent gastrointestinal disease such as exocrine pancreatic insufficiency and are not thought of as primary initiators of disease.
Species which are found in dogs include:
- Blastocystis hominis (subtypes 1, 2, 3, 5 & 10)
The transmission of B. hominis is by the fecal-oral route between animals or via drinking contaminated water or food containing excreted cysts from a reservoir host.
Although mostly nonpathogenic in dogs, clinically affected patients usually present with abdominal pain, mucoid diarrhea and occasionally blood in stools associated with ulerative large bowel enteritis.
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