Doctors now have new tools to diagnose multiple sclerosis , or MS, earlier, sometimes even before a person experiences the symptoms of the autoimmune disease.

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MS is a disease where the immune system attacks the protective covering around nerves known as myelin.

“We can now diagnose MS before someone even has a symptom. It’s really earth shattering,” said Julie Fiol, the associate vice president of Clinical Innovation and Strategy at the National MS Society.

The new guidance for neurologists comes in updates to the McDonald criteria, the checklist doctors

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