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Symptoms are a sign that something you are doing is not working for you. Remove the cause that creates the symptom in the first place, and the symptom disappears by itself.
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I say this is BS, animals in the wild have parasites, plants have parasites. There is never ending war between organisms, no need to find mental/emotional causes.
Radioactive substances and some others harmful substances are probably a cause of the increase of the load of parasitic helminths in some humans because of the lowered efficiency of the immune system.