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Yes, a herpes virus causes them. I don't think anyone said they were of the same strain though...the opposite in fact.

People are actually contagious even if no sores are present, just fyi. There is just a weeping stage of could sores where the virus is most contagious, but even healthy skin can shed the virus, saliva from someone showing no sores, etc. A large majority of people do have oral herpes, whether...