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What is the relationship between infection with the Epstein-Barr virus and multiple sclerosis?

A Harvard University study of 10 million people finds that 97% of people with multiple sclerosis have been infected by the Epstein-Barr virus. This data shows a close link between the mono virus and multiple sclerosis, but a causal relationship cannot be confirmed at this stage. The study has been published in Science.

The Epstein-Barr virus is a necessary factor for developing multiple sclerosis, but is not sufficient on its own.

Epstein-Barr virus infects almost 95% of the population at some point in their lives, but only a small proportion of people who have passed the Epstein-Barr virus are at risk of developing multiple sclerosis.

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