A virus in the brain influences Alzheimer's disease

Most people are exposed to human herpesviruses 6A and 7 early in life.

A group of scientists suggests, in a study released Thursday, the link between Alzheimer's disease, the most common form of dementia, and the presence of viruses in the brain.

The study, published in the Neuron specialty magazine, identified elevated levels of two types of human herpesviruses - 6A and 7 - in brain samples from people showing signs of Alzheimer's disease. Levels have been shown to be lower in healthy brains.

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