I wouldn't say MS is contagious. It is an autoimmune disease, but EBV is a putative risk factor. The paper notes that people are diagnosed with MS 5-10 years

I wouldn't say MS is contagious. It is an autoimmune disease, but EBV is a putative risk factor. The paper notes that people are diagnosed with MS 5-10 years after the EBV initial infection, so would not be contagious from either an EBV or MS point of view. I think around 95% of the population will get EBV at some point in their lives. I'd be very curious to know how a vaccine would impact public health, but I am cautious about it - I suppose there may be some possible positive effects of the virus given humans have probably co-evolved with it.