amebiasis Blastocystis infectious disease Blastocystis infection 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. SCTID:721809007 MONDO:0005671 EFO:0007173 infection, Blastocystis infections, Blastocystis MESH:D016776 parasitic intestinal disorder obsolete_Blastocystis hominis infectious disease