Herpes spreads through direct skin-to-skin or mucous membrane contact with someone who is shedding the virus, whether or not they have visible sores. Over 846 million people aged 15 to 49 are living with genital herpes worldwide, and an estimated 42 million new genital infections occur each year. Understanding exactly how the virus moves between people helps explain why it spreads so efficiently and what you can do to reduce your risk.
How the Virus Gets In and Stays
Herpes simplex virus enters your body through tiny breaks in the skin or through the moist lining of your mouth, genitals, or anus. Once inside, it travels along nearby nerve fibers to clusters of nerve cells. HSV-1 (the type most associated with oral herpes) typically settles into the trigeminal nerves near your jaw. HSV-2 (the type most associated with genital herpes) usually takes up residence in the sacral plexus, a nerve network in your pelvis.
Once the virus reaches those nerve cells, it goes dormant. Most of the infected cells remain “asleep,” but a few are active at any given time. Periodically, the virus reactivates: infected cells wake up, produce new copies of the virus, and send them back along the nerve pathways to the skin’s surface. Sometimes this causes a visible outbreak. Other times, the virus reaches the outer layer of skin without producing symptoms at all, a process called viral shedding.
Skin Contact, Not Bodily Fluids
Herpes is not primarily a bloodborne or airborne infection. It transmits through direct contact between skin or mucous membranes. The most common routes are kissing (for oral HSV-1), vaginal or anal sex (for genital HSV-2), and oral sex, which can move HSV-1 from the mouth to the genitals or vice versa. This crossover is why a growing share of new genital herpes cases are actually caused by HSV-1 rather than HSV-2.
The virus needs warm, moist tissue to survive, so it passes most easily through areas like the lips, inside the mouth, the genitals, and the anus. It can also enter through small cuts or abrasions on other parts of the skin, though this is less common.
Transmission Without Symptoms
One of the most important things to understand is that herpes frequently spreads when the infected person has no sores, no tingling, and no idea they’re contagious. This is called asymptomatic shedding, and it accounts for a significant portion of new infections.
How often shedding happens depends on the virus type and how long someone has been infected. People with genital HSV-2 shed the virus on roughly 34% of days during the first year of infection. Even at the 10-year mark, shedding still occurs on about 17% of days. Genital HSV-1 sheds less frequently: around 12% of days at two months after infection, dropping to about 7% by 11 months. Some people with genital HSV-1 shed no detectable virus at all during monitoring periods, while others shed regularly. There’s no reliable way to feel when shedding is happening.
Oral Sex and Cross-Type Spread
HSV-1 can spread from the mouth to the genitals during oral sex, and this has become one of the more common ways people acquire genital herpes. If your partner has oral herpes (even without a visible cold sore), receiving oral sex from them can result in a genital HSV-1 infection. The reverse is also possible: performing oral sex on someone with genital herpes can lead to oral infection, though this is less common with HSV-2, which reactivates less readily in oral tissue.
The practical takeaway is that oral and genital herpes are not entirely separate conditions. Both virus types can infect either location, and oral sex is the bridge.
Can You Get Herpes From Objects?
Herpes can survive on dry surfaces for anywhere from a few hours to several weeks under laboratory conditions, with longer survival at lower humidity. In practice, though, surface transmission is considered rare. The virus is fragile outside the body compared to many other pathogens, and it needs direct contact with mucous membranes or broken skin to establish infection. Sharing lip balm, razors, or towels with someone during an active outbreak carries a theoretical risk, but the overwhelming majority of transmission happens through person-to-person contact.
Shedding Frequency Over Time
Viral shedding doesn’t stay constant. For genital HSV-2, the first year after infection is the most contagious period, with shedding on about one in three days. That rate roughly halves over the following decade. For genital HSV-1, the decline is steeper: shedding drops from 12% of days early on to 7% within the first year, and some research suggests it may continue declining. This means the risk of transmitting herpes to a partner is highest in the months and years right after acquiring the virus, though it never drops to zero.
Mother-to-Child Transmission
Herpes can pass from mother to newborn during vaginal delivery, and the risk depends almost entirely on timing. A mother who acquires a new genital herpes infection late in pregnancy poses the highest risk to the baby because her body hasn’t yet developed antibodies that could offer partial protection. In contrast, mothers with an established, recurrent infection transmit the virus to their newborn less than 1% of the time. This is why pregnant people are typically screened for herpes history and may be offered antiviral medication or a cesarean delivery if an active outbreak is present near the due date.
What Reduces Transmission Risk
Condoms provide meaningful but incomplete protection. In one large study, people who used condoms more than 75% of the time acquired HSV-2 at about half the rate of those who never used condoms (4.6% versus 8%). The protection is partial because condoms don’t cover all the skin that can shed the virus, particularly around the base of the genitals, the thighs, and the buttocks.
Daily antiviral therapy offers an additional layer of protection. Taking a suppressive dose of antiviral medication reduces the frequency of outbreaks by 70% to 80% and also lowers the rate of transmission to uninfected partners. For couples where one person has genital HSV-2 and the other doesn’t, combining daily antivirals with consistent condom use provides the greatest risk reduction available.
Avoiding sexual contact during active outbreaks is also important, since sores contain high concentrations of the virus. But because asymptomatic shedding drives so many infections, abstaining only during visible symptoms isn’t enough to eliminate risk entirely. The combination of antivirals, condoms, and open communication with partners gives you the most practical control over transmission.