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Scientists at America's National Institutes of Health (NIH) say they may have discovered a critical immune system switch that could affect genes involved in autoimmune diseases. The ground-breaking work, published in the journal Nature, may be useful for developing treatments for autoimmune disorders such as multiple sclerosis (MS)........... Read More - http://www.ms-uk.org/immunecells

It is correct that there is this plasticity of the immune system relative to EBV BARF1.
And that rheumatoid arthritis and MS are similar.

It is a pitty that in this "search for insights into the mechanisms that underlie rheumatoid arthritis and other autoimmune diseases" the viral dimension is not mentioned.