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HSV-1 is usually passed from person to person by kissing. HSV-1 can also spread from the mouth to the genitals during oral sex (fellatio, cunnilingus, analingus). If this happens, it becomes a case of genital herpes. HSV-2 is most often passed by vaginal sex and anal sex.
This article is about the human viruses. For for the genus of animalian simplex viruses, see Simplexvirus. Herpes simplex virus 1 and 2 (HSV-1 and HSV-2), also known as human herpesvirus 1 and 2 (HHV-1 and HHV-2), are two members of the herpesvirus family, Herpesviridae, that infect humans. Both HSV-1 (which produces most cold sores) and HSV-2 (which produces most genital herpes) are ubiquitous and contagious.