Blastocystis hominis and Dientamoeba fragilis

blastocystis hominis diet

Blastocystis hominis diet

This study also highlights the pathogenic role of Blastocystis and reasserts that it should be considered a pathogen when found in conjunction with symptoms and no other infectious agents. Treatment failures highlight the need for further antimicrobial testing to be performed to expand therapeutic options for the management of Blastocystis when treatment failure does occur.
Treatment failure in patients with chronic Blastocystis infection. Journal of Medical Microbiology (2014), 63, 252–257 T.Roberts et al.

Many laboratories in the UK would not be able to exclude D. fragilis and B. hominis, therefore it is possible that some patients infected with these parasites could be misdiagnosed as having IBS. Anecdotal evidence suggests that many patients infected with these parasites are indeed being misdiagnosed as having IBS.

D. fraglis and B. hominis: neglected human protozoa. J. J. Windsor. The Biomedical Scientist. July 2007. Pages 524-27.

The clinical consequences of B. hominis infection are mainly diarrhea or abdominal pain with nonspecific gastrointestinal symptoms such as nausea, anorexia, vomiting, weight loss, lassitude, dizziness, and flatulence.

Irritable Bowel Syndrome: In search of an etiology: role of B. hominis. Javed Yakoob et al. Am. J. Trop. Med. Hyg., 70(4), 2004, pp. 383-385

Most recent literature accepts that D. fragilis is an important enteric pathogen with an estimated incidence of symptomatic infection of between 4 and 91%. Symptoms include abdominal pain, bloating, and diarrhea.

Peek et al, 2004, American Society for Microbiology

“The clinical consequences of B. hominis infection are mainly diarrhea and abdominal pain as well as nonspecific gastrointestinal symptoms such as nausea, anorexia, vomiting, weight loss, lassitude, dizziness, and flatulence. Case reports and series have suggested a pathogenic role of B. hominis in causing intestinal inflammation. Also some studies have suggested that inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS) are associated with B. hominis infection. The investigators indicate that the stools of all patients presenting with IBD or IBS should be examined, and culture methods for B. hominis carried out. Invasion and mucosal inflammation of the intestine with B. hominis have been observed in studies of gnotobiotic guinea pigs.”

Blastocystis hominis and bowel diseases. Turkiye Parazitol Derg. 2006;30(1):72-76

The search for Blastocystis hominis should be a parasitological routine analysis since it is the cause of frequent intestinal disorders. Ponce de Leon P, Svetaz MJ, Zdero M. Rev Latinoam Microbiol. 1991 Apr-Sep;33(2-3):159-64

Dientamoeba fragilis — a protozoal infection which may cause severe bowel distress. Norberg A, Nord CE, Evengard B. Clin Microbiol Infect. 2003 Jan;9(1):65-8

It took me 18 months to have D.fragilis diagnosed, and several more years to find a doctor who was willing to make a serious attempt to treat what turned out to be D.fragilis and Blasto. Unfortunately for me I had caught two gut parasites widely believed by health professionals the world over to be harmless. They were wrong. From 1994 until 2001 I fought to have the parasites recognised as being responsible for my sudden horrible plunge into ill health, but the scientific literature I carried around with me held no interest for the specialists I consulted, which is why it took me so long to find help. This is My Story.

An infection with Blasto. and D.fragilis can trigger tummy aches with altered stool through to full blown chronic illness.

The symptoms of D.fragilis and B.hominis are identical:

Treating parasites

Alternative therapies are rarely effective against B.hominis and D.fragilis. More

Drug treatments: The most widely prescribed drug used to treat Blasto. and D.fragilis is metronidazole despite little to recommend it.

A more effective drug treatment is prescribed by the Centre for Digestive Diseases, GI clinic in Sydney. The CDD first started treating Blasto. and D.fragilis in 2001. Their triple therapy is the most effective treatment currently available for Flagyl resistant Blasto. Cont.

D.fragilis is easier to cure than Blasto. — with the right drugs. More here.

If medicine separated facts from its own beliefs more patients would end up like the ones I’ve documented here.


The medical approach to diagnosing and treating these parasites may exert a higher price than years of unnecessary suffering for patients. There are under-acknowledged and under-recognised consequences resulting from a long term infections:

Diagnosing parasites

A 1983 study in the American Journal of Gastroenterology warned that a single single stool specimen examination will miss many pathogenic protozoan infections in symptomatic persons. Over three decades later this test is still the diagnostic standard in many countries.

Essential facts you should know gleaned from the scientific literature about stool testing

IBS & Parasites

Is the IBS industry too big to fail? Why do IBS think tanks insist that stool testing is unnecessary in patients with IBS symtpoms, when studies show that at least half of patients with IBS harbour Blasto. and D.fragilis? Why the disconnect? Read more here.

Medical Mismanagement

For almost two decades I’ve been documenting what happens to people with D.fragilis and Blasto. What I’ve witnessed via correspondence and phone conversations is a damning indictment of how the medical establishment has handled the question of Blasto. and D.fragilis’ pathogencity. There is still no broad consensus among doctors on whether these gut parasites cause symptoms. Some sections of the medical profession continue to deny the impact Blasto. and D.fragilis can have on human health. Their stance has had real consequences for many people, including me.

After 100 years of debating, it’s about time the medical establishment made up its collective mind so that patients don’t have to suffer any longer than absolutely necessary from what is, ultimately, a treatable infection. In the meantime this is what patients have had to endure over the years:

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