Blastocystis infection - including symptoms, treatment and prevention
Blastocystis is a single-celled parasite which is commonly found in people who have diarrhoea or other intestinal symptoms. There is a great deal of debate about whether Blastocystis causes illness or not. Often there is another cause of the symptoms which has not yet been found.
Blastocystis infection is found throughout the world, especially in developing countries, and occurs in humans and many other types of animals.
How Blastocystis is spread
It is not known how the infection is transmitted, but it may be through contaminated food and water.
In fact, there is not much that is known with certainty about Blastocystis and research is under way to try to understand what it is and what it does.
Signs and symptoms of Blastocystis infection
Symptoms which may be caused by Blastocystis include:
watery or loose bowel motions or diarrhoea
itching around the anus (back passage)
However many people in whom Blastocystis is found have no symptoms at all.
(time between becoming infected and developing symptoms)
Unknown. Blastocystis may remain in the intestines for years.
(time during which an infected person can infect others)
It is not known if person-to-person spread occurs.
Treatment for Blastocystis infection
Since there is debate about whether Blastocystis causes illness or not, treatment is not usually needed and most infections will go away without any treatment. A doctor may consider treatment in people with symptoms after other infectious or non-infectious causes have been excluded.
Prevention of Blastocystis infection
As it is not known how the infection is spread, the best advice is to maintain good personal hygiene practices, prepare food carefully and avoid drinking water that may not be clean.
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