Herpes spreads through direct skin-to-skin contact with someone who carries the virus, even when they have no visible sores. There are two types: HSV-1, which typically causes oral herpes (cold sores), and HSV-2, which typically causes genital herpes. Both can infect either location, and more than 1 in 5 adults worldwide between ages 15 and 49 are living with a genital herpes infection.
The Main Routes of Transmission
Herpes requires contact with infected skin, mucous membranes, or bodily fluids. The specific fluids and surfaces that can transmit the virus include herpes sores, saliva from someone with oral herpes, genital fluids from someone with genital herpes, and the skin around the mouth or genitals of an infected person. You don’t need to touch an open sore to contract it. Contact with skin that looks completely normal can be enough.
HSV-1 spreads mainly through oral contact: kissing, sharing drinks, or any mouth-to-mouth or mouth-to-skin exposure. It can also travel from the mouth to the genitals during oral sex, which is an increasingly common cause of genital herpes. HSV-2 spreads primarily during vaginal, anal, or oral sex through contact with genital or anal skin, sores, or fluids.
In rare cases, herpes can pass from a mother to her baby during delivery. The risk depends heavily on timing. If the mother is experiencing her very first outbreak at the time of delivery, transmission rates can reach as high as 60%. If she has a recurrent infection (meaning she’s had herpes for a while and her body has built up antibodies), the risk drops to less than 2%.
Why People Spread It Without Knowing
The reason herpes is so widespread is that the virus doesn’t need an active outbreak to spread. This process, called asymptomatic shedding, means the virus periodically becomes active on the skin surface with no sores, no tingling, and no warning signs. Research from the University of Washington found that people with genital HSV-1 shed the virus on about 12% of days in the first two months after infection, dropping to around 7% of days by 11 months. In most of those instances, participants had no symptoms at all.
This is why many people contract herpes from partners who genuinely don’t know they’re infected. The virus can be present and transmissible on what looks and feels like perfectly healthy skin.
What Happens After Exposure
If you’re exposed to herpes and the virus takes hold, symptoms typically appear within 2 to 12 days. A first outbreak is usually the most noticeable: small blisters or sores around the mouth or genitals, sometimes accompanied by flu-like symptoms such as body aches, swollen lymph nodes, and fatigue. Some people, however, never develop visible symptoms at all, or their symptoms are so mild they mistake them for something else entirely, like razor burn or a yeast infection.
After the initial infection, the virus retreats into nerve cells and stays in the body permanently. It can reactivate periodically, causing new outbreaks that tend to be shorter and less severe than the first. The frequency of outbreaks varies enormously from person to person, and many people experience fewer and milder episodes over time.
Can You Get Herpes From Objects or Surfaces?
This is one of the most common concerns people have. Herpes can technically survive on dry surfaces for anywhere from a few hours to several weeks, with longer survival at lower humidity levels. However, the virus is fragile outside the body and requires direct contact with a mucous membrane or broken skin to establish an infection. Contracting herpes from a toilet seat, towel, or doorknob is considered extremely unlikely. The overwhelming majority of infections come from direct person-to-person contact.
How Condoms and Antivirals Affect Risk
Condoms reduce the risk of herpes transmission, but they offer less protection than they do against infections like HIV or chlamydia. The reason is straightforward: herpes can live on skin that a condom doesn’t cover, such as the base of the penis, the upper thighs, or the vulva. The CDC describes condom protection against herpes as “limited” for this reason. Still, consistent condom use does lower the odds and remains worthwhile.
Daily antiviral therapy provides an additional layer of protection. Taking a daily antiviral medication decreases the rate of HSV-2 transmission to an uninfected partner. Combining daily antivirals with condom use offers the best risk reduction currently available, though neither method eliminates the possibility of transmission entirely.
Who Is Most at Risk
Globally, an estimated 520 million people had genital HSV-2 infections in 2020, and another 376 million had genital HSV-1 infections. Some 50 million people carry both types simultaneously. These numbers reflect how common and how easily transmissible the virus is.
Your risk of contracting herpes increases with the number of sexual partners you have, unprotected sexual contact, and having a partner who is newly infected (since viral shedding tends to be more frequent early on). People with other sexually transmitted infections may also be more susceptible, as any break in the skin or inflammation in the genital area can make it easier for the virus to enter the body. Receiving oral sex from someone with a history of cold sores is a risk that many people overlook, but it accounts for a significant and growing share of new genital herpes cases.