A pathogen is an organism such as a bacteria, fungus or virus
which causes disease. Something which is pathogenic has
the ability to cause disease.
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Not all bacteria, fungi, viruses, protozoa,
or other microbes are pathogens or, more correctly, are pathogenic;
only those which cause disease. Most microbes are harmless
and many are actually
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| beneficial to humans such as those
which live in the gut and aid digestion.
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A pathogen as the cause of multiple sclerosis has been the leading theory
since multiple sclerosis was first documented. Considering the number
of diseases which are caused by pathogens, it is easy to see why this
theory has been foremost.Although there is some research, such as
that on Epstein Barr and the Herpes virus, which shows some statistical
correlation, no virus or other pathogen has ever been isolated as
the cause of multiple sclerosis.
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