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.

Synonyms: Infections, Blastocystis, Infections, Blastocystis hominis, Blastocystis hominis Infections, Blastocystis Infection, Blastocystis hominis Infection, Infection, Blastocystis, Blastocystis Infections, Infection, Blastocystis hominis