Blastocystis infectious disease (MONDO_0005671, a Monarch Disease Ontology identifier) is infections with organisms of the genus blastocystis. The species B. hominis is responsible for most infections. Parasitologic surveys have generally found small numbers of this species in human stools, but higher positivity rates and organism numbers in aids patients and other immunosuppressed patients (immunocompromised host). Symptoms include abdominal pain; diarrhea; constipation; vomiting; and fatigue. Also known as: Blastocystis infection.