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Definition
By Mayo Clinic staffBlastocystis hominis (B. hominis) is a microscopic parasite sometimes found in the stools of healthy people as well as in the stools of those who have diarrhea, abdominal pain or other gastrointestinal problems. Infection with B. hominis is called blastocystosis.
Researchers don't yet fully understand the role that B. hominis plays in causing an infection. Certain subtypes of this parasite may be more likely to cause infection, or may pose a risk only when combined with other types of infection. In some cases, the parasite simply resides in the digestive tract without causing harm.
There are no proven treatments for Blastocystis, and the infection usually clears up on its own. However, if signs and symptoms don't improve, your doctor may recommend trying medications.
- Fact sheet: Blastocystis hominis infection. Centers for Disease Control and Prevention. http://www.cdc.gov/ncidod/dpd/parasites/blastocystishominis/factsht_blastocystis_hominis.htm. Accessed June 3, 2010.
- Ortega-Barria E. Blastocystis hominis. In: Long SS, et al., eds. Principles and Practice of Pediatric Infectious Diseases. 3rd ed. Philadelphia, Pa.: Churchill Livingstone Elsevier; 2008. http://www.mdconsult.com/das/book/body/203022604-3/1004582449/1679/264.html#4-u1.0-B978-0-443-06687-0..50263-0_4635. Accessed June 3, 2010.
- Leder K, et al. Blastocystis species. http://www.uptodate.com/home/index.html. Accessed June 3, 2010.
- Stensvold CR, et al. Eradication of blastocystis carriage with antimicrobials: Reality or delusion? Journal of Clinical Gastroenterology. 2010;44:85.
- Wanke CA. Travelers' diarrhea. http://www.uptodate.com/home/index.html. Accessed June 3, 2010.
- Wash your hands. Centers for Disease Control and Prevention. http://www.cdc.gov/Features/HandWashing/. Accessed June 3, 2010.
- Conner BA. Traveler's diarrhea. Centers for Disease Control and Prevention. http://wwwnc.cdc.gov/travel/yellowbook/2010/chapter-2/travelers-diarrhea.aspx. Accessed June 3, 2010.
- Oral rehydration solutions: Made at home. Rehydration Project. http://rehydrate.org/solutions/homemade.htm#recipes. Accessed June 3, 2010.
- NSF standards and certification. Water Quality Association. http://www.wqa.org/sitelogic.cfm?ID=1897. Accessed June 22, 2010.
- Anderson CF (expert opinion). Mayo Clinic, Rochester, Minn. June 10, 2010.
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