Blastocystis hominis--a potential intestinal pathogen

West J Med. 1989 Nov;151(5):518-9.


The parasite Blastocystis hominis has been found in 10% to 18% of stool specimens submitted to microbiology laboratories. Controversy exists as to whether this organism can cause illness in humans. We have reviewed the records of 65 symptomatic patients with B hominis in their stool. We conclude that B hominis is a potential pathogen that may or may not require drug therapy depending on the overall clinical circumstances, the severity of symptoms, and the presence of other pathogenic organisms.

MeSH terms

  • Animals
  • Eukaryota / pathogenicity*
  • Humans
  • Intestinal Diseases, Parasitic / diagnosis*
  • Intestinal Diseases, Parasitic / drug therapy
  • Metronidazole / therapeutic use
  • Protozoan Infections / diagnosis*
  • Protozoan Infections / drug therapy


  • Metronidazole