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Intestinal parasites


Intestinal parasites are not normal inhabitants of a healthy GI tract. They survive in the gut by living off the hosts food supply and have the potential to cause harm.

Contaminated food and water supplies, international travel, pets, mosquitoes and fleas, and sexual transmission have contributed to an increased prevalence of intestinal parasites.

In general, symptoms of parasitic infection can include diarrhoea with or without mucus and/or blood, fever, nausea, or abdominal pain. However, these symptoms do not always occur and can vary from person to person. Parasitic infections should not be left untreated, as chronic parasitic infections can cause damage to the intestinal lining and can be the cause of illness and fatigue. Chronic parasitic infections can also be associated with increased intestinal permeability, irritable bowel syndrome, irregular bowel movements, malabsorption, gastritis or indigestion, skin disorders, joint pain, allergic reactions, decreased immune function, and fatigue.

Blastocystis hominis

Blastocystis hominis is a common protozoan found throughout the world. Blastocystis is transmitted via fecal/oral transmission or by ingestion of contaminated food or water.

It is controversial as to whether Blastocystis infection may cause symptoms; it is fair to say that some individuals with B Hominis remain asymptomatic whilst others experience extreme symptoms.

It is often the case that B Hominis will often be present with other parasitic organisms, bacteria, or viruses. Nausea, diarrhoea, abdominal pain, anal itching, weight loss, and excess gas have been reported in some persons with Blastocystis infection.

Dientamoeba Fragilis

Infection with D Fragilis does not necessariy cause obvious symptoms, or it can cause Diarrohea and a painful; abdomen in some people.  Occasionally there may be some blood seen in the stool.  It is transmitted via contaminated water or in food containing pinworm eggs.

Entamoeba coli

Infection often is free of sysmptoms, or mild diarrohea.  Occasionally this ‘bug’ can cause symptoms not limited to the GI tract.  Pateints have reported that they felt strange all over.  Transmission is also via contaminated food or water.

Endolimax Nana

This is a small amoeba and I see this frequently in stool test results at my clinic.  E Nana is thought to be a possible cause of rhematoid arthritis.  Transmission is via contaminated food or water.


Holford, P. Improve your digestion (Optimum Nutrition Handbook) Hachette Digital, 2010.