Also relevant: > “Active [herpes] infection may not be a requirement for Alzheimer’s disease,” Kaplan and his colleagues wrote. A history of herpes infection m

Also relevant: > “Active [herpes] infection may not be a requirement for Alzheimer’s disease,” Kaplan and his colleagues wrote. A history of herpes infection might be “sufficient to initiate Alzheimer’s.” > But not in everyone. An estimated two-thirds of people 50 and younger are infected with HSV-1. Although nothing close to that number will develop Alzheimer’s from a virus or anything else, scientists aren’t sure what combination of genetics, lifestyle, and other factors determines who will.