Yes, you can spread genital herpes even with no visible sore, and yes, the same person can transmit it to a partner. But you can't "re-catch" the same type you already have. Once HSV is in your body, it stays for life. What matters is spread to others, recurrences, and how to lower both.
about 12%
but well controlled
| Item | Value |
|---|---|
| Adults 14–49 with HSV-2 | ~1 in 8 — about 12% |
| Unaware they have it | ~87% |
| Daily antivirals cut spread | ~50% |
| Cure | none — but well controlled |
The essentials: what genital herpes actually is
Genital herpes is caused by one of two related viruses — herpes simplex virus type 1 (HSV-1) and type 2 (HSV-2) CDC. After the first infection, the virus retreats to nerve roots near your spine and lives there permanently, periodically traveling back to the skin. There's no cure. The antivirals we have control symptoms and shedding but don't eradicate the latent virus, and they don't change how often you'll have outbreaks once you stop taking them.
Most people with genital herpes have no symptoms or very mild ones, and the majority of HSV-2 infections are never diagnosed. The diagnosis is hard to hear, but clinically it's a manageable skin condition. Most people see their outbreaks fade over the years, and daily medication can make them rare.
Can you reinfect yourself or catch the same type twice?
No. Once you have HSV-2, you can't acquire HSV-2 again from a partner or from your own body, because your immune system already recognizes that type. What people mistake for "reinfection" is usually a recurrence: the virus you already carry reactivating at the same spot. You can, however, have both types at once (for example, HSV-1 orally and HSV-2 genitally), because immunity to one type doesn't fully block the other.
Why HSV-1 vs HSV-2 changes everything
The type you have predicts how your infection will behave. Genital HSV-1 — the "oral" virus, now commonly passed to the genitals through oral sex — recurs far less often than HSV-2. In one US young-adult cohort the share of new genital herpes caused by HSV-1 climbed from 31% to 78%, and genital HSV-1 tends to recur only about once in the first year, versus roughly four times a year for HSV-2 HSV-1 cohort study. HSV-2 also sheds virus and recurs more often. So if you're told which type you have, you've learned a lot about what to expect.
Symptoms: first outbreak, recurrences, and silent shedding
A first outbreak is usually the worst one. It typically starts as small blisters that break open into painful sores on or around the genitals, rectum, or mouth, taking a week or more to heal. Many people also get flu-like symptoms — fever, body aches, and swollen glands — because the body is meeting the virus for the first time.
Repeat outbreaks are shorter and milder. Some are announced by a prodrome — a tingling, itching, or burning in the skin a day or so before sores appear — which is a useful warning if you take medication at outbreaks. Over time, outbreaks tend to get less frequent.
You can pass herpes when you feel completely fine. People with HSV-2 shed virus on about 10% of days even when they never get outbreaks, and most of that shedding leaves no visible sore JAMA shedding study. Most genital herpes is transmitted by people who don't know they're infected or who have no symptoms at the moment. Assuming "no sore means no risk" is the most common and costly mistake people make.
Testing: get the right test at the right time
The test you need depends on whether you have a sore. If you do, swab the lesion — a type-specific NAAT or viral culture, with swab-based testing working best CDC testing guidance. Go in while the sore is fresh, because a healing or crusted-over sore yields far less virus to detect. A clinic visit during an active outbreak gets you the most reliable diagnosis and tells you which type you have.
Without a sore, a type-specific blood (serologic) test can help, but it has real limits. Screening people who have no symptoms is not recommended — the CDC does not advise routine HSV-2 blood screening in the general population, largely because false positives are common and a wrong result causes a lot of needless distress. If you're trying to figure out the right timing, see our guide on when to test after exposure, and you can also get tested for other infections at the same visit.
Treatment: episodic vs suppressive, and taking it for a partner
Three FDA-approved antivirals — acyclovir, valacyclovir, and famciclovir — control symptoms but do not cure CDC treatment guidelines. They're cheap generics. There are two ways to use them, and choosing between them drives any herpes treatment decision:
| Approach | How you take it | Best for |
|---|---|---|
| Episodic therapy | A short course started at the first sign of an outbreak (or during the prodrome) | Infrequent outbreaks; shortens and eases each episode |
| Suppressive therapy | A pill taken every day | Frequent recurrences, or wanting to lower transmission to a partner |
Daily suppressive therapy reduces recurrences by 70%–80% in people who get frequent outbreaks, and it lowers the odds of passing HSV-2 to a partner. In a randomized trial of couples where one partner had HSV-2 and the other didn't, daily suppressive valacyclovir cut the risk of transmission by about 48% Corey et al., NEJM. That's the evidence behind taking a daily pill partly for someone else's sake. For dosing details and how to pick a regimen, see our full guide to genital herpes treatment.
Prevention: what works and what it doesn't
No single step makes transmission impossible, but layering a few cuts the risk substantially:
- Use condoms — they decrease HSV-2 transmission but don't eliminate it, since they can't cover all the skin that may shed virus.
- Avoid sex during outbreaks and during a prodrome, when shedding is highest.
- Consider daily suppressive antivirals, which make transmission to a partner less likely.
- Tell partners before sex. Disclosure lets them make an informed choice and is part of standard, ethical care.
- Don't rely on feeling fine, since silent shedding spreads herpes.
If you or a partner is pregnant or planning to be, the stakes and the plan shift, because the main danger is passing HSV to a newborn at delivery. Antiviral medication taken late in pregnancy (suppressive acyclovir from around 36 weeks) reduces signs at delivery and the need for a cesarean, and anyone with active genital lesions when labor begins should deliver by cesarean to protect the baby. We cover this fully in genital herpes and pregnancy.
When to see a clinician
See a clinician promptly if you have new genital sores, blisters, or unexplained genital pain — and try to go while a sore is fresh so it can be swabbed. Also reach out if your outbreaks are frequent or distressing (you may benefit from suppressive therapy), if you have a partner who doesn't have herpes and you want to lower transmission, or if you're pregnant or trying to conceive. A first outbreak with severe pain, trouble urinating, or a high fever deserves same-day care.