Research has suggested a link between herpes simplex virus type-1 (HSV-1) and an increased risk of Alzheimer's disease.
The HSV-1 infection is most commonly associated with cold sores. Individuals with a history of the infection have been found to have an 80 per cent higher risk of developing Alzheimer's, according to a large-scale US study by pharmaceutical company Gilead Sciences and the University of Washington in Seattle.
