>First a question. Are americans generally more exposed to parasites than
other western people? I ask >because I have never in my adult life heard of
anyone who has problems with parasites. I got giardia >lambia once in the
80's when I visited Leningrad and it caused diarrhoea and the pain that
comes with >diarrhoea. The parasite went away after one pill prescribed by a
doctor.

Giardia is easy to get rid of, blastocystis hominis is not. It has become
resistant to most medications as well as herbal products. They form a
protective mucous layer/shield around themselves making it almost impossible
to penetrate.