HSV-1: Cold sores spread from person to person by close personal contact, such as kissing. Cold sores are caused by a herpes simplex virus (hsv-1) closely related to the one that causes genital herpes (hsv-2). Both of these herpes simplex viruses can affect your mouth or your genitals, and can be spread via oral sex. The virus can be transmitted to others even during times when you have no blisters.
Answered 12/9/2013
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