Thirty years on, research linking viral infections with Alzheimer's is finally getting the attention it deserves

The common cold sore virus, which is often caught in childhood, usually stays in the body for life—quietly dormant in the nerves. Now and then, things like stress, illness or injury can trigger it, bringing on a cold sore in some people. But this same virus—called herpes simplex virus type 1—may also play an important role in something far more serious: Alzheimer's disease.

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