Genital Herpes: Facts, Testing, and What Treatment Can Do

The short answer#

Genital herpes is a common viral infection caused by herpes simplex virus type 1 (HSV-1) or type 2 (HSV-2). There is no cure, but it is very manageable: antiviral medicine can shorten outbreaks, reduce how often they return, and lower the chance of passing the virus to a partner. Most people carry it with few or no symptoms, and many never know they have it. A routine blood antibody test is not recommended for people without symptoms, because false positive results are common and can cause needless worry.

Key points#

• Both HSV-1 and HSV-2 cause genital herpes. HSV-1 now accounts for a growing share of new genital cases, often from oral-to-genital contact.
• About 1 in 8 people aged 14 to 49 in the United States carries HSV-2, and most do not know it.
• The virus spreads by skin-to-skin contact and can pass even when no sores are visible, which is called asymptomatic shedding.
• To diagnose a sore, a swab tested by NAAT or PCR is preferred over older viral culture, and it identifies which type you have.
• Type-specific blood tests have real limits. Routine screening of people without symptoms is not recommended because false positives are common.
• Episodic therapy treats a single outbreak. Daily suppressive therapy cuts recurrences by roughly 70 to 80 percent and lowers transmission.
• There is no cure, but outbreaks usually become less frequent over time, and for most people the infection does not shorten life or cause cancer.

How common is genital herpes, and how does it spread?#

Herpes is one of the most common infections in adults, which is part of why calm, accurate information matters. In United States data from 2015 to 2016, about 12 percent of people aged 14 to 49 carried HSV-2, with a higher rate in women (near 16 percent) than in men (near 8 percent). HSV-1, the type long associated with cold sores, is far more common still and increasingly turns up as a cause of first-episode genital infection.

The virus passes through direct skin-to-skin and mucosal contact. It does not spread through toilet seats, towels, or swimming pools. The point that surprises many people is that transmission often happens when the person carrying the virus has no visible sores and feels completely well, and this asymptomatic shedding is why most new infections come from partners who did not know they were carriers. It also means that a first outbreak can appear in a long-term, mutually faithful relationship without anyone having done anything wrong.

This topic sits within our broader library on women's, men's, and reproductive health, and it often comes up alongside conversations about contraception and barrier methods.

Why does type-specific testing matter, and what can it not tell you?#

There are two very different testing situations, and mixing them up causes most of the confusion.

When you have an actual sore, testing the lesion is the reliable path. A swab analyzed by a nucleic acid amplification test (NAAT or PCR) is preferred because it is more sensitive than viral culture, and it reports the type, HSV-1 or HSV-2. Typing matters because HSV-1 genital infection tends to recur less often than HSV-2, which changes what to expect and how to counsel.

When you have no symptoms, the picture is different. Type-specific blood tests look for antibodies, not the virus itself. The US Preventive Services Task Force recommends against routine antibody screening in people without symptoms, including during pregnancy, giving it a grade D. The reason is accuracy: in a general population, the positive predictive value of some widely used tests can be around 50 to 75 percent, meaning a large share of positives are false. Low positive index values are especially unreliable and should be confirmed before anyone is told they carry the virus.

A blood test also cannot tell you where the infection is on your body or when you acquired it. A positive HSV-2 antibody result does not reveal which partner it came from or how long it has been present. For those reasons, a diagnosis is best anchored to a tested sore whenever possible, with antibody testing reserved for specific situations a clinician can help you weigh.

What is the difference between episodic and suppressive treatment?#

Antiviral medicines (valacyclovir, acyclovir, and famciclovir) do not remove the virus from the body, but they work well to control it. There are two strategies, and many people move between them over the years.

Episodic therapy is often the right first choice for someone with occasional, tolerable outbreaks. Suppressive therapy makes more sense when recurrences are frequent, painful, or disruptive, or when reducing transmission to a partner is a priority. There is no wrong answer, and preferences change with life circumstances.

How can I lower the chance of passing herpes to a partner?#

Several measures stack together, and none of them is all-or-nothing. Daily suppressive medicine is one of the strongest. In a large trial, the HSV-2 positive partner took valacyclovir 500 mg once daily or placebo for eight months. Over that period, 1.9 percent of partners in the valacyclovir group acquired HSV-2, compared with 3.6 percent in the placebo group. That is close to a halving of risk, not a fall to zero, and in plain numbers, about 59 people would need to take daily medicine for eight months to prevent one partner infection.

It is worth being precise about how this differs from HIV. For HIV, sustained effective treatment can bring the risk of sexual transmission to effectively zero, the idea explored in our piece on Undetectable Equals Untransmittable: The Evidence. Herpes does not work that way. Suppression lowers the odds meaningfully but does not eliminate them, so the honest message is risk reduction, not risk removal.

Other layers help. Condoms reduce, though do not abolish, transmission. Avoiding sexual contact during an outbreak or its warning signs (tingling, itching, or pain in the area) removes the highest-risk windows. Telling a partner allows shared decisions. As with HIV prevention medication, the benefit of any daily therapy depends heavily on taking it consistently, a point we unpack in How We Know HIV PrEP Works and Why Adherence Changes the Number. Because a herpes conversation often overlaps with birth control choices, it can be a natural time to review Contraception in Primary Care: Methods and How to Choose.

What if I am pregnant?#

Herpes in pregnancy is managed carefully because the main concern is the newborn at delivery. Professional obstetric guidance offers daily suppressive antiviral therapy from around 36 weeks to people with a history of genital herpes, which reduces outbreaks and viral shedding near term. A cesarean delivery is recommended when active genital lesions or warning symptoms are present at labor. If you are pregnant and have any history of genital herpes, tell your prenatal clinician early so a plan is in place.

Is herpes curable, and how should I think about a diagnosis?#

Herpes is not curable. After the first infection, the virus stays dormant in nerve cells and can reactivate, which is why outbreaks can return. That said, the trajectory is usually reassuring: recurrences tend to become less frequent and milder over the years, many people have long stretches with nothing at all, and the infection does not affect fertility, is not cancer, and does not shorten life for otherwise healthy people.

A diagnosis often lands harder emotionally than the medical facts justify. The virus is common, treatable, and compatible with relationships, sex, and pregnancy. Stigma, not the biology, is usually the heavier burden, and accurate information is the antidote.

When to seek care#

• A first suspected outbreak, so a clinician can swab a sore, confirm the diagnosis, and identify the type.
• Severe pain, difficulty urinating, or sores that spread widely or do not heal.
• Frequent or distressing recurrences, which is a good reason to ask about suppressive therapy.
• Pregnancy with any history of genital herpes, or a new outbreak as delivery approaches.
• A weakened immune system together with an outbreak, since infections can be more serious.
• Any sores or symptoms near the eyes, or specific worries about protecting a partner.

For a diagnosis or a treatment plan, talk with a licensed clinician who knows your history.