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Massachusetts General Hospital

New evidence that viruses may play a role in Alzheimer's

Viruses that sneak into the brain just might play a role in Alzheimer's, scientists reported Thursday in a provocative study that promises to re-ignite some long-debated theories about what triggers the mind-robbing disease.

The findings don't prove viruses cause Alzheimer's, nor do they suggest it's contagious.

But a team led by researchers at New York's Mount Sinai Health System found that certain viruses — including two extremely common herpes viruses — affect the behavior of genes involved in Alzheimer's.

The idea that infections earlier in life might somehow set the stage for Alzheimer's decades later has simmered at the edge of mainstream medicine for years....

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