Epstein Barr Virus (EBV), also called Human Herpes Virus 4, is ubiquitous, meaning almost every (> 90%) one of us has been exposed to the virus by adulthood. The virus exists in a latent form in B lymphocytes and usually causes no problems. Being exposed and infected with EBV does not by itself increase your risk of MS. If it did there would be a whole lot of people with MS. It is hypothesized (this means there is not enough evidence to prove this point yet) that the increased risk of MS occurs only in individuals with an abnormally regulated host (meaning you) response to EBV; this abnormal host response to EBV may also be linked to vitamin D deficiency. Now you can see why we encourage people with MS to take Vitamin D.
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