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What are the Chances of Getting Herpes from an Infected Partner?
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What Are the Chances of Getting Herpes from an Infected Partner?
If your partner has genital herpes and you don't, your chance of catching it is roughly 4–10% per year without any precautions — around 10% for women and around 4% for men, based on a landmark study of 144 couples. Condoms, daily antiviral tablets and avoiding sex during outbreaks can cut that risk to about 1–2% a year.
Those numbers surprise most people. Genital herpes has an outsized reputation, but the actual per-year transmission risk in a monogamous couple is far lower than the stigma suggests — and it drops sharply once you take simple, evidence-based steps.
This guide explains exactly what the chances of getting herpes from an infected partner are, what changes those odds, and what you can realistically do about it.
Key Facts: Herpes Transmission Risk at a Glance
- Baseline annual risk: ~10% male-to-female, ~4% female-to-male in couples taking no precautions.
- Per-act risk: Very low — roughly 1 in 300 or less for a single unprotected encounter.
- Condoms: Reduce acquisition risk by about 30% over a year (pooled analysis, 5,384 people).
- Daily antivirals: Reduce overall HSV-2 acquisition by 48% and symptomatic infection by 75%.
- Biggest hidden factor: About 70% of transmissions happen when the infected partner has no symptoms at all.
- Protective factor: Existing HSV-1 antibodies (from childhood cold sores) substantially lower the risk of catching HSV-2.
How likely are you to get herpes from an infected partner?
The most reliable figures come from a prospective study by Mertz and colleagues, published in the Annals of Internal Medicine. Researchers followed 144 heterosexual couples in which one partner had symptomatic, recurrent genital herpes and the other had no evidence of infection, for a median of 334 days.
Transmission occurred in 14 couples — 9.7% overall. Crucially, the risk was not equal in both directions:
| Direction of transmission | Couples who transmitted | Approximate annual risk |
|---|---|---|
| Man with herpes → woman without | 11 of 65 | 16.9% |
| Woman with herpes → man without | 3 of 79 | 3.8% |
| Overall (both directions combined) | 14 of 144 | 9.7% |
| Woman with no prior HSV-1 or HSV-2 antibodies | — | 31.8% |
| Woman with existing HSV-1 antibodies | — | 9.1% |
Two things stand out. First, women are roughly four times more likely to catch genital herpes from a male partner than the reverse, because the vaginal and vulval mucosa presents a larger, thinner surface for the virus to cross. Second, prior exposure to HSV-1 — the virus most people pick up as cold sores in childhood — appears to offer meaningful partial protection.
These figures come from couples who were aware of the diagnosis and had already received counselling. They are a fair starting point, but your personal risk sits on a spectrum rather than a fixed number.
What are the chances from a single sexual encounter?
Very low. Modelling studies put the per-act risk of male-to-female HSV-2 transmission at somewhere around 0.3% without protection, and lower still in the other direction. The annual figures look higher simply because risk accumulates across dozens or hundreds of exposures over twelve months.
Put plainly: one unprotected encounter with an infected partner is unlikely to transmit herpes. A year of unprotected encounters carries a meaningful chance. This is why consistency of precautions matters far more than any single decision.
Does it matter how long your partner has had herpes?
Yes. Someone newly infected sheds the virus far more often than someone who has lived with it for years. Viral shedding — the periods when the virus is active on the skin surface and can be passed on — declines steadily over time as the immune system establishes control.
A partner diagnosed a decade ago with one or two mild recurrences a year poses a substantially lower risk than a partner diagnosed three months ago.
What affects your risk of catching herpes from a partner?
Transmission is not a coin flip. These are the variables that move the number, ranked by how much difference they make.
| Factor | Effect on risk | Why |
|---|---|---|
| Sex during an active outbreak | Sharply increases | Viral load on the skin is highest when lesions are present |
| Sex during prodrome (tingling, itching, nerve pain) | Increases | The virus is already reactivating before blisters appear |
| Recent infection in the source partner | Increases | Shedding frequency is highest in the first year |
| Susceptible partner is female | Increases ~4× | Larger, more permeable mucosal surface area |
| Higher frequency of sexual contact | Increases | More exposures, more cumulative opportunity |
| Another untreated STI or broken skin | Increases | Inflammation and ulceration ease viral entry |
| Weakened immune system (HIV, chemotherapy, immunosuppressants) | Increases | More frequent and prolonged shedding |
| Existing HSV-1 antibodies in the susceptible partner | Decreases | Partial cross-immunity |
| Consistent condom use | Decreases ~30% | Covers the highest-risk contact area |
| Daily suppressive antivirals for the infected partner | Decreases ~48% | Cuts asymptomatic shedding by 80–90% |
| Long-standing relationship | Decreases | Shedding declines over years; the susceptible partner may have already been exposed without becoming infected |
Can you catch herpes if your partner has no symptoms?
Yes — and this is the single most misunderstood fact about herpes.
In the Mertz study, detailed histories were available for 13 of the 14 transmissions. In nine cases the infected partner reported no symptoms whatsoever at the time. In four more, transmission happened during prodrome or within hours before blisters were first noticed. Roughly 70% of transmissions occurred during asymptomatic viral shedding.
Research using daily PCR swabbing has quantified how often this happens. People with symptomatic HSV-2 shed the virus on approximately 20% of days; people with HSV-2 who have never noticed symptoms still shed on approximately 10% of days. Genital HSV-1 sheds less frequently, and declines over the first year after infection.
What this means in practice: "No sores, no risk" is wrong. Avoiding sex during outbreaks is worthwhile and reduces risk, but it does not eliminate it. Meaningful protection comes from combining precautions, not from timing alone.
It also explains why so many people are infected without knowing. Most people with genital herpes have never had a recognisable outbreak — which means a partner who has "never had herpes" may simply have never been tested. An advanced sexual health test or at-home STI test kit is the only way to know your own status with any confidence.
How common is genital herpes?
Far more common than public conversation suggests. According to the World Health Organization's most recent estimates:
- 846 million people aged 15–49 worldwide are living with a genital herpes infection caused by either HSV-1 or HSV-2 — more than 1 in 5 of that age group.
- 520 million people aged 15–49 (about 13%) have HSV-2, the virus most often responsible for genital herpes.
- 376 million had genital HSV-1 infections in 2020 — nearly double the 2016 estimate, reflecting a real shift towards HSV-1 as a cause of genital infection.
- Around 42 million new genital herpes infections occur each year — roughly one person every second.
- Approximately 205 million people experienced at least one symptomatic episode in 2020.
- An estimated 3.8 billion people under 50 carry HSV-1, mostly as oral infection acquired in childhood.
The pattern is shifting. While HSV-2 prevalence has held roughly steady since 2016, genital HSV-1 infections are rising — largely because fewer children now acquire oral HSV-1, leaving more adolescents and adults susceptible to picking it up genitally through oral sex.
How is genital herpes passed on?
Herpes simplex spreads by direct skin-to-skin and mucous-membrane contact. It is not a blood-borne virus, and it does not survive long outside the body.
| Route | Can it transmit herpes? | Notes |
|---|---|---|
| Vaginal sex | Yes — high | The most common route for HSV-2 |
| Anal sex | Yes — high | Delicate mucosa; can cause anal or rectal lesions |
| Oral sex (mouth to genitals) | Yes | A cold sore can transmit HSV-1 to the genitals |
| Genital-to-genital skin contact without penetration | Yes | Condoms don't cover all affected skin |
| Kissing | Yes — for oral HSV-1 only | Cannot cause genital herpes directly |
| Sharing unwashed sex toys | Yes | Wash between uses; use a fresh condom on shared toys |
| Childbirth (mother to newborn) | Yes — rare but serious | Highest risk if first infection occurs late in pregnancy |
| Toilet seats, towels, swimming pools, cutlery | No | The virus dies rapidly outside the body |
| Hugging, sharing a bed, casual contact | No | No mucosal or lesion contact involved |
If your outbreaks affect the anal area specifically, our guide on how to treat anal herpes covers management in more detail. For symptoms affecting the mouth, see how to treat herpes on the tongue.
Herpes transmission: myth vs fact
| Myth | Fact |
|---|---|
| "If there are no sores, you can't pass it on." | Around 70% of transmissions occur during asymptomatic shedding. |
| "Condoms make herpes impossible to catch." | They reduce risk by roughly 30% — meaningful, but not complete, because the virus can shed from uncovered skin. |
| "HSV-1 is the harmless one." | HSV-1 causes an increasing share of genital herpes cases. Genital HSV-1 typically recurs less often, but the initial episode can be just as severe. |
| "A negative STI screen means you don't have herpes." | Standard STI screens usually exclude herpes. You need a specific type-specific HSV blood test or a swab of an active lesion. |
| "Herpes causes infertility." | It does not. Genital herpes has no effect on fertility in men or women. |
| "You can't have children safely with herpes." | Most women with pre-existing genital herpes have healthy babies and vaginal deliveries. Risk is managed with antivirals from around 32 weeks. |
| "Herpes means your sex life is over." | Serodiscordant couples routinely stay together for decades without transmission using antivirals and condoms. |
| "If I've had it for years, I'm not contagious." | Shedding declines but never reaches zero. Risk falls; it doesn't vanish. |
What are the symptoms of genital herpes?
Symptoms typically appear 2 to 12 days after the virus enters the body, though some people have no symptoms for months or years — or never at all. The first episode is usually the most severe.
| First episode | Recurrent outbreak | |
|---|---|---|
| Typical duration | 2–4 weeks | 5–10 days |
| Pain level | Often significant | Usually mild |
| Number of lesions | Multiple, often bilateral | Fewer, usually one area |
| Flu-like symptoms | Common (fever, aches, headache) | Uncommon |
| Swollen groin lymph nodes | Common | Rare |
| Warning signs beforehand | Usually none | Prodrome: tingling, itching, shooting nerve pain |
| Needs antiviral treatment? | Yes — start within 5 days | Optional; helps if started at prodrome |
Signs to look for
- Small fluid-filled blisters on the genitals, anus, buttocks or thighs, which burst to leave red, open sores and crust over as they heal
- Painful ulcers, which on brown or black skin may appear less red and more like darkened or raised patches
- Stinging or burning when passing urine, particularly if urine touches an open sore
- Unusual vaginal or penile discharge
- Swollen, tender lymph nodes in the groin
- Flu-like symptoms during a first episode — fever, muscle aches, headache, general malaise
- Tingling, itching or shooting pains in the genitals, buttocks or legs before an outbreak (prodrome)
Timeline of a typical first outbreak
- Days 0–2: Tingling, itching or burning at the site of infection; sometimes flu-like symptoms.
- Days 2–5: Small red bumps develop and become fluid-filled blisters.
- Days 4–8: Blisters rupture into shallow, painful ulcers. This is the most uncomfortable stage and the most infectious.
- Days 8–14: Ulcers dry and crust over. Pain begins to settle.
- Days 14–28: Crusts fall away and skin heals, usually without scarring.
Symptoms that look similar can be caused by syphilis, chancroid, thrush, folliculitis or contact dermatitis, which is why a clinical diagnosis matters. Our guide to female STI symptoms.
What causes genital herpes? HSV-1 vs HSV-2 explained
Genital herpes is caused by the herpes simplex virus, of which there are two types. Both belong to the Herpesviridae family and both can infect the genital area. After the first infection, the virus travels to a nearby sensory nerve ganglion — usually the sacral ganglia for genital infection — where it lies dormant and can reactivate.
| HSV-1 | HSV-2 | |
|---|---|---|
| Most common site | Mouth and lips (cold sores) | Genitals and anus |
| Can it cause genital herpes? | Yes — an increasing share of cases | Yes — the classic cause |
| Usual route of first infection | Non-sexual contact in childhood, or oral sex in adulthood | Sexual contact |
| Global prevalence (under 50s) | ~3.8 billion | ~520 million aged 15–49 |
| Recurrence rate when genital | Low — often fewer than one episode a year | Higher — a median of 4–5 episodes in year one |
| Genital shedding | Declines markedly over the first year | Persists long-term |
| Neonatal risk | Present | Present |
Point of accuracy: HSV-1 does not cause chickenpox. Chickenpox and shingles are caused by varicella-zoster virus (VZV), a different member of the same viral family. Herpes simplex is also not transmitted through blood.
How do you know if you or your partner has herpes?
There are two ways herpes is diagnosed, and they answer different questions.
Swab test (PCR) — for active symptoms
If you have visible blisters or ulcers, a clinician swabs the lesion and tests it by PCR. This is the most accurate method and identifies whether the infection is HSV-1 or HSV-2. It only works while lesions are present, and results become less reliable once sores have dried out. NHS sexual health clinics offer this free of charge.
Type-specific blood test (IgG) — for no current symptoms
A blood test looks for antibodies to HSV-1 and HSV-2. It can identify a past infection even without symptoms, but it has real limitations you should understand before testing:
- Antibodies take up to 12 weeks to develop, so a test taken too soon after exposure can be falsely negative.
- A positive HSV-1 result cannot tell you whether the infection is oral or genital.
- Low-positive HSV-2 results can be false positives and may need confirmatory testing.
- Routine population screening is not recommended by UK or US guidelines, because a diagnosis in someone without symptoms carries psychological cost without clear clinical benefit.
Where a blood test genuinely helps is in serodiscordant couples — if one partner has genital herpes, testing the other establishes whether they are already infected, and therefore whether precautions are needed at all. A significant number of couples discover both partners already carry the same virus.
Welzo's Herpes Simplex 1 and 2 blood test checks for type-specific antibodies from a home sample. If you'd like broader screening, our Advanced Sexual Health Test covers multiple infections in one kit. If you're unsure how home testing works, read how a home STI test works.
How can you reduce the risk of passing herpes to a partner?
No single measure eliminates risk, but stacking them reduces it substantially. Here is how the evidence stacks up.
| Strategy | Estimated risk reduction | Evidence base |
|---|---|---|
| Daily suppressive antivirals (source partner) | 48% overall acquisition; 75% for symptomatic infection | Randomised controlled trial, 1,484 couples (Corey et al., NEJM 2004) |
| Consistent condom use | ~30% over one year | Pooled analysis of 6 prospective studies, 5,384 participants (Martin et al., 2009) |
| Avoiding sex during outbreaks and prodrome | Reduces peak-risk exposures | Observational; ~30% of transmissions linked to symptomatic or prodromal periods |
| Disclosure to partner | ~50% reduction reported | Cited in BASHH UK national guidance; likely mediated by behaviour change |
| Combining antivirals + condoms + outbreak avoidance | Annual risk falls to roughly 1–2% | Derived by combining the above; no single trial has tested the full combination |
Step-by-step: reducing transmission risk in a serodiscordant couple
- Confirm both partners' status. Type-specific blood testing may reveal the susceptible partner is already infected, in which case no precautions are needed.
- Talk about it openly. Disclosure is associated with around a 50% reduction in transmission, largely because it enables every other precaution on this list.
- Discuss suppressive antivirals. The partner with herpes takes a daily tablet — typically aciclovir 400mg twice daily, or valaciclovir 500mg once daily.
- Use condoms consistently. Every time, not just during high-risk periods. Consistency drives the benefit.
- Learn the prodrome. Tingling, itching or shooting leg pain signals reactivation. Avoid genital contact from prodrome until lesions have fully healed.
- Use dental dams or condoms for oral sex. Cold sores can transmit HSV-1 to the genitals; genital lesions can transmit to the mouth.
- Treat other STIs promptly. Genital inflammation and ulceration raise transmission risk in both directions.
- Review annually. Shedding and recurrence frequency decline over time. What's appropriate in year one may be more than you need in year five.
Do condoms prevent herpes?
Partially. A pooled analysis of six prospective studies covering 5,384 people found that those using condoms 100% of the time had a 30% lower risk of acquiring HSV-2 than those who never used them. Risk rose steadily with each unprotected act, and protection was equal for men and women.
Thirty per cent is real protection, but it falls short of what condoms achieve against chlamydia or HIV. The reason is anatomical: herpes sheds from skin across the whole genital area, including the scrotum, upper thighs, buttocks and perineum, which a condom cannot cover.
Does suppressive antiviral therapy reduce transmission?
Yes — this is the strongest single intervention available, and it is the only one supported by a randomised controlled trial with transmission as the endpoint.
Corey and colleagues randomised 1,484 heterosexual, monogamous, HSV-2-discordant couples to either valaciclovir 500mg once daily or placebo for eight months. Symptomatic HSV-2 developed in 0.5% of partners in the treatment group versus 2.2% on placebo — a 75% reduction. Overall acquisition, including asymptomatic infection, was 1.9% versus 3.6% — a 48% reduction.
Antivirals work by suppressing viral replication, which reduces asymptomatic shedding by around 80–90% according to BASHH's 2024 UK national guideline on anogenital herpes. The guideline notes that aciclovir 400mg twice daily suppresses shedding at least as effectively as valaciclovir 1g daily, and recommends aciclovir as first-line on cost grounds.
Daily suppressive therapy: pros and cons
Pros
- Roughly halves the chance of transmitting the virus to a partner
- Reduces recurrence frequency by 70–80% in most people
- Well tolerated; over 20 years of continuous safety surveillance
- No routine blood monitoring required in people with normal kidney function
- Reduces the anxiety that often accompanies a new diagnosis
Cons
- Requires taking a tablet every day, indefinitely
- Does not eliminate transmission risk
- Full effect takes about five days to establish
- Possible side effects — headache, nausea, diarrhoea — usually mild
- A "bounce-back" outbreak is common 4–5 days after stopping a long course
- Dose adjustment needed in significant kidney impairment
Who should consider suppressive therapy?
UK guidance generally supports it if any of the following apply:
- You have six or more recurrences per year
- Recurrences are severe, prolonged or significantly affecting your quality of life
- You are in a relationship with a partner known not to have the virus
- You are pregnant with a history of genital herpes — usually from around 32 weeks
- You are immunocompromised
BASHH advises stopping suppression after a maximum of one year to reassess how often recurrences actually happen, with the assessment period covering at least two recurrences. If the frequency remains unacceptable, treatment can be restarted.
Prescription options are available through Welzo's genital herpes treatment range, including aciclovir 400mg tablets and valaciclovir, subject to online consultation.
Treatment and management options for genital herpes
Genital herpes cannot be cured, but it is very treatable. Antiviral tablets shorten outbreaks, reduce their severity, and — taken daily — cut both recurrences and transmission risk.
Antiviral dosing chart
| Situation | Medicine | Typical regimen |
|---|---|---|
| First episode | Aciclovir | 400mg three times daily for 5 days |
| First episode (alternative) | Valaciclovir | 500mg twice daily for 5 days |
| Recurrent episode (short course) | Aciclovir | 800mg three times daily for 2 days |
| Recurrent episode (standard) | Aciclovir | 400mg three times daily for 3–5 days |
| Daily suppression | Aciclovir | 400mg twice daily, reviewed after up to 12 months |
| Daily suppression (alternative) | Valaciclovir | 500mg once daily |
| Breakthrough on suppression | Aciclovir | Increase to 400mg three times daily |
| Pregnancy, from 32 weeks | Aciclovir | 400mg three times daily until delivery |
Episodic treatment works best when started at the very first sign of prodrome. Starting more than five days after sores appear makes little difference to the course of that outbreak.
Self-care during an outbreak
- Keep the area clean and dry; pat rather than rub after washing
- Use a saltwater bath or sitz bath to soothe sores and prevent secondary infection
- Apply cool compresses or a covered ice pack for short periods
- Pass urine while sitting in a warm bath, or pour warm water over the area, if urinating is painful
- Take simple pain relief such as paracetamol or ibuprofen, if suitable for you
- Topical lidocaine 2% gel or 5% ointment can numb the area — check suitability with a pharmacist
- Wear loose cotton underwear and avoid tight clothing
- Drink plenty of fluids to dilute urine
- Avoid perfumed soaps, bubble baths and antiseptics, which irritate broken skin
Common mistakes to avoid
- Waiting to see if it clears up. First-episode antivirals are far more effective started early.
- Stopping suppressive therapy the moment things improve. Full suppressive effect takes five days, and stopping abruptly commonly triggers a bounce-back outbreak.
- Assuming a clear STI screen rules out herpes. Herpes is not part of standard screening panels.
- Relying on condoms alone in a serodiscordant relationship. Roughly 30% protection is not the same as protection.
- Using cold sore cream on genital lesions. Topical aciclovir cream is formulated for facial cold sores; genital herpes needs oral antivirals.
- Applying antiseptics or drying agents to open sores. These delay healing and worsen pain.
- Delaying telling a midwife about a herpes history in pregnancy. This is one of the few situations where herpes carries serious risk, and it is highly manageable when disclosed early.
For site-specific guidance, see how to treat herpes on the penis. Browse the full aciclovir range, or explore Welzo's STI treatment range for other infections.
What is a recurrent outbreak, and what triggers it?
A recurrence is a repeat episode of symptoms caused by the same virus reactivating from the nerve ganglion where it lies dormant. It is not a new infection, and it does not mean you have been reinfected by your partner.
Recurrences are almost always milder and shorter than the first episode. They typically affect the same area, are often preceded by prodrome, and usually resolve within 5–10 days — frequently without treatment.
Common recurrence triggers
- Physical or emotional stress and poor sleep
- Another illness, particularly with fever
- Friction or trauma to the genital skin, including from sex
- Menstruation and hormonal fluctuation
- Ultraviolet light exposure
- Surgery or medical procedures in the area
- Immunosuppression — HIV, chemotherapy, high-dose steroids
- Excess alcohol and periods of exhaustion
Frequency varies enormously. Many people with HSV-2 have several recurrences in the first year, dropping off substantially thereafter. Genital HSV-1 recurs far less often — many people have only one episode ever. A Cochrane review of oral antiviral therapy found suppressive treatment reduces recurrence frequency in immunocompetent, non-pregnant patients, though the authors noted limitations in the quality of the available evidence.
Herpes and pregnancy: what's the actual risk?
This is where genital herpes genuinely matters clinically, and where the risk profile is completely different from the everyday transmission question.
Neonatal herpes is rare but serious. The risk depends almost entirely on when the mother acquired the infection:
- Herpes acquired before pregnancy: Low risk. Maternal antibodies cross the placenta and protect the baby. Most women in this situation have a healthy baby and a vaginal delivery.
- First infection in the third trimester: Substantially higher risk, because there is not enough time to develop and transfer protective antibodies before birth. A caesarean section is usually recommended if the first episode occurs within six weeks of delivery.
Current UK practice, set out in the joint BASHH and RCOG guideline (2024 update), is to offer suppressive aciclovir from around 32 weeks to women with a history of genital herpes, reducing the likelihood of an outbreak at the time of delivery. The NHS follows the same approach.
If you are pregnant, or planning to be, and either you or your partner has genital herpes, tell your midwife early. If you don't have herpes and your partner does, avoiding a first infection during the third trimester is a genuine priority — this is one situation where using condoms throughout pregnancy, and considering suppressive therapy for the partner, is clearly worthwhile.
Expert tips for couples where one partner has herpes
- Test the "negative" partner before assuming anything. A meaningful proportion of couples discover they already share the same virus, which removes the entire question.
- Reassess after the first year. Shedding and recurrences drop over time. The precautions that make sense at diagnosis may be more than you need later.
- Treat prodrome as the signal, not the sores. By the time blisters appear, the highest-risk window has often already started.
- Don't overlook oral sex. A cold sore during a partner's outbreak is a genuine route for genital HSV-1.
- Manage the anxiety as well as the virus. For many people, the psychological impact of diagnosis outweighs the physical symptoms. This is worth raising with a clinician.
- Have the disclosure conversation outside the bedroom. Calm, factual, and with the numbers to hand — most people react far better than expected when given accurate information.
When should you see a doctor?
Book an appointment with a sexual health (GUM) clinic or GP if you notice genital blisters or ulcers for the first time — ideally within five days, while antivirals are most effective. In the UK, sexual health clinics offer free, confidential testing and treatment, and you can self-refer without going through your GP.
Seek urgent medical attention if you experience:
- Inability to pass urine (urinary retention) — a recognised complication of severe first episodes
- Severe headache, neck stiffness or sensitivity to light, which may indicate meningitis
- Sores spreading rapidly, or a high fever that isn't settling
- Symptoms while pregnant, particularly in the third trimester
- Symptoms while immunocompromised
- Any herpes symptoms in a newborn baby
Welzo's online sexual health services offer discreet consultations and treatment if you'd prefer not to attend a clinic in person.
Frequently asked questions about herpes transmission
Can you be with someone with herpes and never get it?
Yes, and it's common. With daily antivirals, consistent condom use and avoiding sex during outbreaks, annual transmission risk falls to roughly 1–2%. Many serodiscordant couples remain together for decades without transmission. Some susceptible partners also have partial protection from existing HSV-1 antibodies.
How long after exposure would I know if I caught herpes?
Symptoms, if they appear at all, usually show 2–12 days after exposure. Blood-test antibodies can take up to 12 weeks to develop, so a negative blood test before that point doesn't rule out recent infection. If you develop sores, get a swab test straight away — it's more accurate than a blood test at that stage.
Can I get herpes from a partner who has never had symptoms?
Yes. Most people with genital herpes have never had a recognisable outbreak, and asymptomatic individuals still shed the virus on roughly 10% of days. A partner saying they've "never had herpes" often means they've never been tested rather than that they're definitely negative.
Can you get genital herpes from kissing?
Not directly. Kissing transmits oral HSV-1. However, HSV-1 acquired orally can subsequently be passed to a partner's genitals through oral sex — which is why genital HSV-1 infections are rising.
Does having cold sores mean I'm protected against genital herpes?
Partly. In the Mertz study, women with existing HSV-1 antibodies had an annual HSV-2 acquisition rate of 9.1%, compared with 31.8% in women with no prior HSV antibodies. That's meaningful cross-protection, but it is far from immunity — you can still acquire HSV-2.
Can herpes be transmitted through a toilet seat or towel?
No. Herpes simplex is fragile outside the body and dies quickly on surfaces. It requires direct skin-to-skin or mucous-membrane contact. Toilet seats, towels, swimming pools, cutlery and bedding do not transmit it.
Do I have to tell a partner I have herpes?
There is no UK legal requirement to disclose an STI in most circumstances, but disclosure is strongly recommended clinically — BASHH guidance notes it is associated with around a 50% reduction in transmission. It also allows your partner to make an informed choice and enables precautions like suppressive therapy.
Can you get herpes twice, or catch a different strain?
Once you have HSV-2, you won't catch HSV-2 again — existing antibodies prevent reinfection with the same type. It is possible, though uncommon, to acquire the other type separately. Recurrent symptoms are reactivation of the virus you already have, not reinfection from your partner.
Is genital herpes more dangerous than oral herpes?
Both are caused by closely related viruses and are usually mild in healthy adults. Genital herpes carries more clinical significance because of neonatal transmission risk during childbirth and because HSV-2 increases the risk of acquiring and transmitting HIV. Neither is dangerous for most people outside those contexts.
Does herpes affect fertility?
No. Genital herpes has no effect on fertility in men or women, and does not damage the reproductive organs. Most women with pre-existing genital herpes have healthy pregnancies and vaginal deliveries.
Key takeaways
- The chances of getting herpes from an infected partner are roughly 10% a year for women and 4% a year for men without precautions — around 9.7% overall.
- Risk per single encounter is very low; it accumulates over months of repeated exposure.
- Around 70% of transmissions occur with no symptoms present, so timing sex around outbreaks helps but is not sufficient on its own.
- Daily suppressive antivirals cut acquisition by 48% and symptomatic infection by 75% — the strongest single intervention.
- Consistent condom use reduces risk by about 30%.
- Combining antivirals, condoms and outbreak avoidance brings annual risk down to roughly 1–2%.
- Pre-existing HSV-1 antibodies offer partial protection against acquiring HSV-2.
- Herpes is common, manageable and lifelong — more than 1 in 5 people aged 15–49 worldwide has a genital herpes infection.
If you want to know your status, Welzo's Herpes Simplex Virus 1 and 2 blood test checks for type-specific antibodies from home. If you already have a diagnosis and want to reduce recurrences or protect a partner, our genital herpes treatments are available following a short online consultation.
Sources and further reading
- World Health Organization — Herpes simplex virus fact sheet
- NHS — Genital herpes
- NICE Clinical Knowledge Summaries — Herpes simplex — genital
- BASHH — UK national guideline for the management of anogenital herpes, 2024
- BASHH / RCOG — Management of HSV in pregnancy and the neonate, 2024 update
- Mertz GJ et al. — Risk factors for the sexual transmission of genital herpes, Ann Intern Med 1992
- Corey L et al. — Once-daily valaciclovir to reduce the risk of transmission of genital herpes, NEJM 2004
- Martin ET et al. — A pooled analysis of the effect of condoms in preventing HSV-2 acquisition, Arch Intern Med 2009
- Harfouche M et al. — Global and regional incidence and prevalence of HSV infections, 2020, Sex Transm Infect 2025
- InformedHealth.org / NCBI — Preventing the spread of herpes in sexual relationships
This article is for information only and does not replace personalised medical advice. Speak to a GP, pharmacist or sexual health clinician about your own circumstances. If you are pregnant or immunocompromised, seek clinical advice before starting or stopping any treatment.
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