Easy to say. I have herpes simplex-1 from infancy. I was born in 1936 and can assure you that no one knew a thing about viruses back then. I do recall that my mother had cold sore outbreaks from time to time as do I. She died in her seventies and if she ever had anything resembling Alzheimers, it wasn't evident to me or anyone else in the family for that matter.
http://www.freerepublic.com/focus/f-news/2195681/posts
VERY sad story, the headline claimed the newborn was killed by her own mother's kiss...