Blastocystis hominis

Blas·to·cys·tis hom·i·nis

a species of Blastocystis widespread among humans, formerly considered harmless, now recognized as a rare cause of diarrhea and other intestinal symptoms and eosinophilia when found in heavy infections or immunocompromised hosts.

Blastocystis hominis

A single-celled protozoan parasite isolated from 5–10% of stool specimens in developed countries and up to 50% of specimens in developing countries, especially in those who work with animals.

Clinical findings
B hominis was long known to cause gastrointestinal disease in immunocompromised patients—e.g., recurrent diarrhoea, episodic vomiting, abdominal colic; B hominis infection may be misdiagnosed as irritable bowel syndrome. 

Nomenclature
Experts have proposed dropping hominis, the species name for Blastocystis sp. subtype nn (where nn is the number of each species group). It is phylogenetically included in the group Stramenopiles, which also includes brown algae, mildew, diatoms and the bacteria that caused the Irish potato famine.

Blastocystis hominis

(blăs′tō-sĭs″tĭs hŏm′ĭn-ĭs)
A protozoan once thought to be a harmless commensal in the human gastrointestinal tract but now believed to be an intestinal parasite that produces diarrhea, abdominal pain, bloating, and weight loss in some people.
References in periodicals archive ?
The Comprehensive Stool Analysis with Parasitology tests for the main 50 species of parasites, such as Blastocystis hominis, Entamoeba, Giardia, and Cryptosporidium.
The highest outbreaks of protozoan infections were related to Blastocystis hominis whereas Endolimax nana showed the lowest incidence (Figure 1).
(%), Co-infection N = 370 n = 337 Blastocystis hominis 91 (24.6) 85 (25.2) Entamoeba hystolitica/dispar 56 (15.1) 53 (15.7) Giardia lamblia 25 (6.8) 24 (7.1) Strongyloides stercoralis 73 (19.7) 67 (19.9) Hookworms 39 (10.5) 37 (11.0) Trichuris trichiura 11 (3.0) 10 (3.0) Ascaris lumbricoides 10 (2.7) 8 (2.4) Schistosomiasis 34 (9.2) 31 (9.2) S.
As Blastocystis hominis has been shown to have significant effects on the intestinal microbiota, it has been associated with several diseases, such as colitis, irritable bowel syndrome, hemorrhagic proctosigmoiditis, and chronic urticaria (12).
Segun la organizacion mundial de la salud (OMS), la prevalencia de infecciones parasitarias causadas por protozoarios es alta respecto a las generadas por helmintos (4), siendo Giardia intestinales, Blastocystis hominis, Entamoeba coli y Complejo Entamoeba los protozoarios con mayor incidencia (1,4).
Moitinho, "Blastocystis hominis and other intestinal parasites in a community of Pitanga city, Parane State, Brazil," Revista do Instituto de Medicina Tropical de Sao Paulo, vol.
Another reasonable explanation of these results may be the detection of some silent infections in these patients such as Blastocystis hominis (B.
Salem, NH, November 15, 2016 --(PR.com)-- ALPCO is now offering a line of research assays for the investigation of common bacterial and parasitic gastrointestinal (GI) pathogens including Giardia lamblia, Cryptosporidium spp., Blastocystis hominis, Entamoeba histolytica/dispar, and Clostridium difficile.