Herpes is spread by direct skin to skin contact. Unlike a flu virus that you can get through the air, herpes spreads by direct contact, that is, directly from the site of infection to the site of contact. For example, if you have a cold sore and kiss someone, you can transfer the virus to their mouth. Similarly, if you have active genital herpes and have vaginal or anal intercourse, you can give your partner genital herpes. Herpes is most easily spread when a sore is present, but, it is also often spread at other times too.
Some people notice itching, tingling or other sensations before they see anything on their skin.
Herpes is most likely to be spread from the time these first symptoms are noticed until the area is completely healed and the skin looks normal again. Sometimes those who know they are infected spread the virus between outbreaks, when no signs or symptoms are present. Research also shows that herpes simplex infections are often spread by people who don't know they are infected. These people may have symptoms so mild they don't notice them at all or else don't recognize them as herpes. For those who recognize their symptoms, asymptomatic transmission appears to be far less likely than spreading the virus when lesions are present.