Herpes spreads primarily through direct skin-to-skin contact with someone who carries the virus. You don’t need to touch an open sore to get it. The virus can pass from skin that looks completely normal, which is why most people who transmit herpes don’t realize they’re doing so. About 12% of Americans ages 14 to 49 carry genital herpes (HSV-2), and up to 90% of them don’t know it.
The Two Types Spread Differently
There are two strains of herpes simplex virus, and each has a preferred route of transmission. HSV-1, the type most people think of as “cold sores,” spreads through contact with sores, saliva, or skin around the mouth. Kissing is the most common way to catch it. But HSV-1 can also cause genital herpes when someone with oral herpes performs oral sex on a partner.
HSV-2 is the strain more closely associated with genital herpes. It spreads during vaginal, anal, or oral sex through contact with genital or anal skin, sores, or fluids. HSV-2 transmits even when no sores are visible, and in fact it is often passed along in the absence of any symptoms at all.
Why It Spreads Without Symptoms
Herpes simplex virus lives inside nerve cells and cycles between active and inactive states. Even during periods with no visible sores, the virus can reactivate briefly and reach the skin surface. This is called asymptomatic shedding, and it’s the reason herpes spreads so easily without anyone noticing.
Research tracking daily genital swabs found that people with symptomatic HSV-2 shed the virus on about 20% of days, while those who’ve never had a noticeable outbreak still shed on roughly 10% of days. The amount of virus released during these silent episodes is similar to what’s shed during visible outbreaks. HSV-1 in the genital area sheds far less frequently, around 0.5% of days, which is one reason genital HSV-1 recurs less often and is less likely to be passed to partners.
What Doesn’t Spread Herpes
You’re unlikely to catch herpes from a toilet seat, towel, or doorknob. While lab conditions show the virus can survive on dry surfaces for anywhere from a few hours to several weeks (longer in low humidity), real-world transmission from objects is not considered a meaningful risk. The virus requires the kind of direct, sustained skin contact that happens during kissing or sex. Casual interactions like handshakes, hugging, or sharing food don’t pose a realistic transmission risk.
Timeline From Exposure to Symptoms
If you do contract herpes, symptoms typically appear 6 to 8 days after exposure, though the incubation window ranges from 1 to 26 days. The first outbreak is usually the most noticeable, often involving painful blisters or ulcers at the site of infection, sometimes with flu-like symptoms. Many people, however, never develop obvious symptoms at all, or mistake their first outbreak for something else entirely.
If you think you’ve been exposed but don’t have symptoms, blood tests can detect herpes antibodies, but your body needs time to produce them. Current tests may take up to 16 weeks after exposure to reliably detect infection, so testing too early can produce a false negative.
How to Lower the Risk
Condoms reduce the chance of transmission but don’t eliminate it, because herpes can live on skin that a condom doesn’t cover. One large study found that 8% of people who never used condoms acquired HSV-2, compared to 4.6% of those who used condoms more than 75% of the time. That’s roughly a 40% reduction in risk with consistent use.
Daily antiviral medication taken by the partner who carries the virus also lowers transmission rates. For couples where one person has genital HSV-2 and the other doesn’t, daily suppressive therapy cuts the risk of passing it on. Combining condoms with antiviral medication provides the strongest protection short of abstaining from contact during outbreaks.
Avoiding sexual contact during active outbreaks makes a significant difference as well. The greatest risk of transmission exists when sores are present, even though the virus can spread at other times. For oral herpes, this means avoiding kissing or oral sex when cold sores are visible.
Transmission During Pregnancy
Herpes can pass from mother to baby during vaginal delivery, but the risk depends heavily on timing. A new genital herpes infection acquired in the third trimester, especially the last six weeks, poses the highest danger to the newborn. In these cases, a cesarean delivery is typically recommended. The risk drops substantially if the mother had genital herpes before pregnancy or was first infected earlier in pregnancy, because her body has had time to develop antibodies that also help protect the baby.