So not totally and completely caused by then

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The National Multiple Sclerosis Society says that the risk of developing MS in the general population is around one in 1,000.

other

In contrast, Epstein-Barr virus infection is staggeringly common and can be found in around 95 percent of people.

Then

The virus that causes herpes is likely the main cause of multiple sclerosis (MS), a groundbreaking study suggests.

Maybe not. If almost everyone has EB and not everyone has MS, then there must be some other cause.

Linked, quite possibly, could even be a necessary precondition, but there must also be something else. Propensity to, random damn bad luck, some other infection, summat.

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