Herpes spreads through direct skin-to-skin contact with someone who carries the virus, whether or not they have visible sores at the time. There are two types: HSV-1, which most people pick up in childhood through casual contact like kisses from family members, and HSV-2, which spreads almost exclusively through sexual contact. Over 846 million people between the ages of 15 and 49 have a genital herpes infection worldwide, making it one of the most common viral infections on the planet.
HSV-1: The Type Most People Get as Kids
HSV-1 is mainly transmitted through contact with the virus in sores, saliva, or the skin in and around the mouth. For most people, this happens in childhood. A parent or relative with a cold sore kisses a child on the lips, or a child shares a cup or utensil with someone who’s shedding the virus. The exchange doesn’t need to be dramatic. Saliva on skin is enough.
Because HSV-1 is so easily passed through everyday contact, the majority of the global population carries it by adulthood. Many people never develop noticeable symptoms, so they have no idea they’re infected. The virus enters through mucous membranes (the moist lining of the mouth, for example) or through tiny, invisible breaks in the skin, then travels to nerve cells where it stays permanently.
How Oral Herpes Becomes Genital Herpes
HSV-1 can spread from the mouth to a partner’s genitals during oral sex. This is now a significant source of new genital herpes cases, particularly among young adults. If you receive oral sex from someone with oral herpes, even if they have no visible cold sore, the virus can establish itself in the genital area. Once there, it behaves like any genital herpes infection, with the same potential for outbreaks and transmission to future partners.
This route catches many people off guard because they don’t think of cold sores as a sexually transmitted infection. But the virus doesn’t distinguish between body parts. It infects whatever skin or mucous membrane it lands on.
HSV-2: Spread Through Sexual Contact
HSV-2 is the type most associated with genital herpes and is transmitted during vaginal, anal, or oral sex. Of the roughly 520 million people living with genital HSV-2 globally, 92% of those with symptomatic episodes have this type. The virus passes through direct contact with genital skin, sores, or the fluids from sores. It enters through mucous membranes or micro-abrasions in the skin that are too small to see or feel.
You don’t need to have penetrative sex to transmit or contract HSV-2. Skin-to-skin genital contact is sufficient. The virus is most contagious during an active outbreak when sores are present, but it also spreads when no symptoms are visible at all.
Why People Spread It Without Knowing
Asymptomatic shedding is the reason herpes spreads so efficiently. The virus periodically reactivates and travels back to the skin surface, releasing viral particles even when there are no sores, tingling, or any other sign of infection. The person shedding has no way to tell it’s happening.
The shedding rates differ substantially between the two types. HSV-2 sheds on about 34% of days in the first year after infection and still 17% of days at the ten-year mark. Genital HSV-1 sheds less frequently: around 12% of days two months after the initial infection, dropping to 7% by eleven months, and falling further to about 1.3% of days by two years. In most instances during these shedding episodes, the person has no symptoms at all.
This is why so many people who transmit herpes genuinely believe they’re “clean.” They’ve never had a noticeable outbreak, or they haven’t had one in years, yet the virus is still intermittently present on their skin.
Can You Get Herpes From Objects or Surfaces?
Herpes can technically survive on dry surfaces for anywhere from a few hours to several weeks, with longer survival at lower humidity. However, transmission from objects like towels, toilet seats, or shared razors is considered extremely unlikely in real-world conditions. The virus is fragile outside the body and needs a certain amount of viable particles to establish an infection. Practically speaking, herpes spreads through direct human contact, not through surfaces.
Mother-to-Baby Transmission
Neonatal herpes is rare but serious. In about 85% of cases, the virus passes from mother to baby during vaginal delivery if the virus is active in the genital tract at the time. The risk depends heavily on timing. A first-time genital herpes infection during the second half of pregnancy carries the highest risk because the mother’s body hasn’t had time to build antibodies that could cross the placenta and protect the baby.
If a woman already had genital herpes before becoming pregnant, the risk drops significantly. Her immune system has already produced antibodies, and those pass to the baby during pregnancy. Even if the virus reactivates during delivery, the baby has some built-in protection. A woman with prior exposure to one type of HSV who contracts the other type during pregnancy still faces elevated risk, though her existing antibodies offer partial protection compared to someone with no prior HSV exposure at all.
Reducing the Risk of Transmission
Condoms reduce the risk of herpes transmission but don’t eliminate it, because the virus can shed from skin that a condom doesn’t cover. In one study, 8% of participants who never used condoms acquired HSV-2 over the study period, compared to 4.6% of those who used condoms more than 75% of the time. The more consistently condoms were used, the lower the rate of new infections.
Daily antiviral therapy makes a larger difference. When someone with HSV-2 takes a daily antiviral, transmission to an uninfected sexual partner drops by about 75% compared to no treatment. Combining daily antivirals with consistent condom use and avoiding sex during active outbreaks provides the most protection.
Avoiding direct contact with active sores is the simplest precaution. During an outbreak, kissing (for oral herpes) or sexual contact (for genital herpes) carries the highest transmission risk. Many couples where one partner has herpes and the other doesn’t successfully avoid transmission for years by combining these strategies.