The herpes viruses are extremely contagious and easily spread. Most people get the virus that causes oral herpes, HSV-1, during infancy or childhood. A kiss, cheek pinching, or other skin-to-skin contact from a person who carries the HSV-1 virus often is all that is needed to pass the HSV-1 virus to a child. The infected child may or may not develop herpes sores.
A person who has an active herpes sore also can spread the HSV-1 virus by sharing objects such as eating utensils, lip balm, or even a razor.
Genital herpes generally spreads through sexual contact. Most people become infected during sexual intercourse. If a sexual partner has a cold sore fever blister and perform oral sex, this can spread the HSV-1 virus, causing herpes sores on the genitals.
Infected persons also can spread the virus to unaffected parts of their own bodies by touching a herpes sore and immediately touching unaffected skin.