Scientists have found new evidence linking the Epstein-Barr virus to multiple sclerosis (MS). In a recent study, researchers discovered that MS patients have much higher levels of "killer" T cells, which are immune cells that target fossils of the virus, in their nervous systems compared to their blood.

The team also identified a specific viral gene that was active only in people with MS. This suggests the gene may help trigger the faulty immune response that causes the disease. These findings could lead to new ways to treat MS, such as therapies designed to target and neutralize the virus directly.