Yes, and many couples stay that way for years, with one partner infected and the other not. Herpes doesn’t pass on with every sexual contact, so the risk for a regular partner builds slowly rather than all at once. In one study of couples, about 1 in 10 uninfected partners caught it in a year.1PubMed. Risk of acquisition of genital herpes simplex virus type 2 in sex partners of persons with genital herpes: a prospective couple study The partner who seems uninfected sometimes already carries the virus and has simply never noticed a symptom. So the first real question for a couple is often which of you truly has it, not only how to protect the other.
How Often Herpes Passes Between Partners
The direction of the infection matters.2PubMed. Risk of acquisition of genital herpes simplex virus type 2 in sex partners of persons with genital herpes: a prospective couple study When the infected partner is a man, women caught it at about 11 to 17% a year.3Government of Canada. Genital herpes guide: Risk factors and clinical manifestations When the infected partner is a woman, men caught it at about 3 to 4% a year.4Government of Canada. Genital herpes guide: Risk factors and clinical manifestations
Women catch it more easily partly because the genital skin the virus can reach is a larger, more delicate area. A woman whose male partner has herpes gains the most from adding every protective step.
Each unprotected act carries a small risk, not a guarantee. Over months and years those small risks add up, which is why long-term couples still need a plan.
Past cold sores change the odds. Partners who had never had either herpes type caught genital herpes more often, about 23% over roughly 16 months.5PubMed. Risk of acquisition of genital herpes simplex virus type 2 in sex partners of persons with genital herpes: a prospective couple study Partners who already carried the cold-sore type, HSV-1, caught it far less often, about 6%.6PubMed. Risk of acquisition of genital herpes simplex virus type 2 in sex partners of persons with genital herpes: a prospective couple study So a partner’s own blood test for HSV-1 can hint at how vulnerable they are, though HSV-1 blood tests can miss some infections.
The two types differ in where they usually live. HSV-1 usually causes cold sores but can also infect the genitals through oral sex. HSV-2 is the type behind most repeated genital outbreaks. Carrying one type gives partial, not full, protection against the other.
Spreading Herpes Without Symptoms
People with genital HSV-2 can have virus on the skin on days they feel nothing. This is called shedding. People who get noticeable outbreaks shed silently on about 13% of days.7PubMed Central. Genital Shedding of Herpes Simplex Virus Among Symptomatic and Asymptomatic Persons with HSV-2 Infection People who never notice symptoms still shed on about 9% of days.8PubMed Central. Genital Shedding of Herpes Simplex Virus Among Symptomatic and Asymptomatic Persons with HSV-2 Infection The amount of virus on those silent days was about the same in both groups.9PubMed Central. Genital Shedding of Herpes Simplex Virus Among Symptomatic and Asymptomatic Persons with HSV-2 Infection
Shedding can also happen on skin a condom doesn’t cover. Skipping sex only during outbreaks lowers the risk but cannot remove it. Most partners catch it on days with no visible sign.
Shedding turns up in nearly everyone who is tested long enough. All women who swabbed themselves daily for over 100 days showed silent shedding at some point.10PubMed. Frequency of asymptomatic shedding of herpes simplex virus in women with genital herpes Shedding from the outer genital skin was as common as from inside the vagina.11PubMed. Frequency of asymptomatic shedding of herpes simplex virus in women with genital herpes
Type matters here too: genital HSV-1 sheds and recurs much less often than HSV-2.12Centers for Disease Control and Prevention. Genital Herpes Knowing which type the infected partner has helps set expectations.
Ways to Keep the Other Partner Herpes-Free
Taking an antiviral pill every day cut silent shedding by about 94% in women.13PubMed. Suppression of subclinical shedding of herpes simplex virus type 2 with acyclovir In couples, daily valacyclovir roughly halved how often the uninfected partner caught HSV-2 over eight months, from 3.6% to 1.9%.14PubMed. Once-daily valacyclovir to reduce the risk of transmission of genital herpes It also cut cases with symptoms by about three-quarters.15PubMed. Once-daily valacyclovir to reduce the risk of transmission of genital herpes The usual dose doctors suggest is valacyclovir 500 mg once a day.16CDC Sexually Transmitted Infections Treatment Guidelines. Genital Herpes
Starting is simple. The infected partner asks their doctor for a prescription and takes the pill once a day, long term. The pills also reduce outbreaks, so that partner benefits too. Missed doses reduce protection, so a routine such as a phone reminder helps. The pills are generally well tolerated and widely available as generics.
Condoms help, especially for women. They cut the risk per act from man to woman by about 96%.17PubMed Central. Effect of Condom Use on Per-act HSV-2 Transmission Risk in HIV-1, HSV-2-discordant Couples They protected men from infected women less, about 65%.18PubMed Central. Effect of Condom Use on Per-act HSV-2 Transmission Risk in HIV-1, HSV-2-discordant Couples People who always used condoms were about 30% less likely to catch HSV-2 than those who never did, and each unprotected act raised the risk further.19PubMed Central. A Pooled Analysis of the Effect of Condoms in Preventing HSV-2 Acquisition
Protection is incomplete because herpes spreads from skin, and condoms leave some genital skin uncovered. That also explains why protection from woman to man is weaker.
Outbreaks call for extra care. Avoid any genital contact from the first tingle until the skin has fully healed. Oral sex during a cold sore can pass HSV-1 to the genitals, and touching a sore and then touching a partner can also spread it. Couples are advised to use daily pills together with condoms and no sex during outbreaks.20CDC Sexually Transmitted Infections Treatment Guidelines. Genital Herpes
When the Partner Who Seems Clear Already Has It
In couples where one partner had genital herpes, about 19% of partners with no history already had HSV-2 on a blood test.21PubMed. Risk of acquisition of genital herpes simplex virus type 2 in sex partners of persons with genital herpes: a prospective couple study Many people with herpes never notice symptoms or mistake them for something else.22PubMed. Risk of acquisition of genital herpes simplex virus type 2 in sex partners of persons with genital herpes: a prospective couple study The uninfected partner should get a type-specific blood test before the couple builds a plan.
If both of you turn out positive, the news may be a relief. Partners who already carry the same type are very unlikely to reinfect each other with it, so the fear of transmission largely goes away. Pills may still help with outbreaks but are not needed to protect the partner. Tests can’t show who gave it to whom. A new diagnosis doesn’t prove recent cheating, because infections can be silent for years.
Why a Positive Herpes Blood Test Can Be Wrong
In one group of people who tested positive for HSV-2 on commercial tests, only about half were confirmed by a more accurate test.23UW Medicine | Newsroom. Study questions reliability of diagnostic tests for herpes Some HSV-2 tests react to the much more common HSV-1 and call it HSV-2.24PubMed Central. Herpes Simplex Virus Infections: An Overview of Testing for the Urgent Care Clinician Men with HSV-1 were more likely to have a false HSV-2 result.25PubMed. Herpes simplex virus type 2 (HSV-2) Western blot confirmatory testing among men testing positive for HSV-2 using the focus enzyme-linked immunosorbent assay in a sexually transmitted disease clinic Accuracy also differs a lot between test brands; with one brand nearly 1 in 3 positives was false.26PubMed Central. Performance characteristics of highly automated HSV-1 and HSV-2 IgG testing
Reports often show an index value, a number for how strongly the test reacted. Results with an index under 3.0 are the most likely to be false.27PubMed. Herpes simplex virus type 2 (HSV-2) Western blot confirmatory testing among men testing positive for HSV-2 using the focus enzyme-linked immunosorbent assay in a sexually transmitted disease clinic Some false positives have higher values too, so a high number isn’t proof.28PubMed. Herpes simplex virus type 2 (HSV-2) IgG index values in two immunoassays in relation to HSV-2 IgG inhibition assay results
To read your report, look for “HSV-2 IgG” and the index number beside it. A typical lab cutoff for positive is just above 1.0. If the result surprises you, ask which test brand the lab used. A positive swab of an actual sore is more reliable than a blood test alone.
If you have no symptoms and a low-positive result, ask for a confirmatory blood test such as a Western blot. It is done at a few specialty labs, may take a couple of weeks, and may cost extra. Until it is confirmed, a low-positive result is a question, not a diagnosis.
When the Other Partner Should Get Tested
It can take up to 16 weeks or more for current blood tests to detect a new infection.29Centers for Disease Control and Prevention. Screening for Genital Herpes Many people show antibodies within about two weeks, some within days.30PubMed Central. Ability of a rapid serology test to detect seroconversion to herpes simplex virus type 2 glycoprotein G soon after infection Testing 12 to 16 weeks after the last possible exposure gives the most reliable answer.31ASHA. Herpes Testing
If a new sore appears, get it swabbed quickly, ideally within a day or two. A swab can confirm herpes and its type even before blood tests turn positive. Bring the partner’s diagnosis details to the appointment.
In an ongoing couple, ask the doctor whether yearly retesting makes sense for the uninfected partner. Retest sooner if any new genital symptoms appear. A positive result later means switching from prevention to managing infection.
Herpes in One Partner During Pregnancy
Herpes in a newborn is the most serious complication, and it comes from contact with the virus during birth.32PubMed. Genital herpes complicating pregnancy A mother who catches herpes in the third trimester has the highest risk of passing it to her baby.33PubMed. Genital herpes complicating pregnancy A pregnant woman without herpes whose partner has it should tell her prenatal doctor and consider avoiding sex in the last trimester.
Couples expecting a baby can ask for type-specific blood tests for both partners early in pregnancy. Oral sex from a partner with cold sores is best avoided late in pregnancy, since HSV-1 can infect the genitals. Women who already had genital herpes before pregnancy pass it to babies far less often. Doctors may also offer antiviral pills near delivery to women with herpes.
Living as a Couple Where One Partner Has Herpes
Early reactions to a diagnosis include surprise, distress, sadness and sometimes relief at knowing.34PubMed Central. Psychosocial impact of serological diagnosis of herpes simplex virus type 2: a qualitative assessment Ongoing worries include feeling undesirable or stigmatized.35PubMed Central. Psychosocial impact of serological diagnosis of herpes simplex virus type 2: a qualitative assessment36PubMed Central. Psychosocial impact of serological diagnosis of herpes simplex virus type 2: a qualitative assessment
Talking it through helps. Share the facts on yearly risk and how pills and condoms reduce it, and decide together which protective steps you’ll use. Revisit the plan if outbreaks, pregnancy plans or test results change.
A diagnosis doesn’t mean ending sex; many couples keep a normal sex life. Outbreaks often become rarer and milder over time. Counseling or support groups help people who feel stigmatized.