Genital Herpes: Diagnosis, Treatment and Transmission

Genital herpes is a manageable condition that most people find much harder to hear about than to live with. The physical illness after the first episode is usually mild and intermittent. The distress that follows the diagnosis is frequently out of proportion to it, and much of that distress comes from misinformation — inflated prevalence figures, imagined transmission routes, and the belief that it makes someone permanently and unavoidably infectious.

This guide covers what the virus actually does, how it is properly diagnosed, how much transmission risk can be reduced, what happens in pregnancy, and where the widely repeated claims about it are simply wrong.

🧬 Two viruses, one condition

Genital herpes is caused by herpes simplex virus, of which there are two types, and which type someone has matters considerably more than most people are told.

In many high-income countries HSV-1 now accounts for a large share of first-episode genital herpes, particularly in younger people, because fewer children acquire oral HSV-1 early in life and therefore reach adulthood without antibodies. That shift is good news for anyone diagnosed: genital HSV-1 recurs far less often and transmits far less readily than HSV-2. Knowing which type you have changes what to expect, which is why type-specific testing is worth insisting on.

🔬 What the virus does

After the first infection, herpes simplex travels along sensory nerves to a cluster of nerve cell bodies near the base of the spine and remains there permanently in a dormant state. It is not being fought off, and it is not being cleared — it is inactive, invisible to the immune system, and beyond the reach of any current treatment.

Periodically it reactivates, travels back down the nerve to the skin, and either produces a visible outbreak or is shed without any lesion at all. That second phenomenon — asymptomatic shedding — is the key to understanding transmission, and it explains why most people acquire genital herpes from a partner who had no symptoms and often did not know they were infected.

Shedding is most frequent in the first year after infection and declines over subsequent years, as do outbreaks. The natural trajectory of this condition is toward less, not more.

🌡️ What it looks like

The first episode is usually the worst, and in people who have never had any herpes infection before it can be genuinely unpleasant: multiple painful blisters and ulcers, swollen tender glands in the groin, fever, headache, aching, and sometimes pain on urination severe enough to cause retention. It typically lasts two to four weeks untreated.

Many first episodes are far milder than that, and a substantial proportion of people have no recognised first episode at all — which is why so many find out years later, and why establishing when infection occurred is usually impossible.

Recurrences are much shorter and milder, typically lasting five to ten days and often preceded by a warning sensation of tingling, itching or nerve pain in the area, the buttock or the thigh. Many people learn to recognise this reliably, which matters because treatment started at that point works considerably better.

Frequency varies widely. Some people have several episodes a year; many have one or two; a large group has none after the first. Episodes become less frequent with time in the great majority of cases.

🧪 Getting a proper diagnosis

This section matters because incorrect testing is common and the consequences are real.

Where there is a lesion, a swab tested by PCR is the best method. It confirms herpes, identifies the type, and is far more sensitive than the older viral culture. Swab an ulcer early rather than waiting, since sensitivity falls as it heals.

Where there is no lesion, type-specific blood testing detects antibodies to HSV-1 and HSV-2 separately. It shows past exposure rather than where the infection is, which is why interpretation needs care.

Routine herpes serology is not part of standard sexual health screening in most guidelines, and there is a reason: a positive result in someone with no symptoms creates considerable psychological burden without changing management for many people. It is appropriate where symptoms suggest herpes but swabs are negative, where a partner has genital herpes, and in some pregnancy situations.

💊 Treatment

Antiviral drugs do not eliminate the virus — nothing does — but they suppress its replication effectively, and they work in two distinct ways depending on what the person needs.

Three antivirals are used and all are effective. Valacyclovir converts to acyclovir in the body but absorbs far better, so it can be taken once or twice daily rather than five times — which is why it has largely displaced plain acyclovir for this condition. Famciclovir is similar. Acyclovir itself remains effective and is the cheapest, at the cost of frequent dosing.

For the first episode, treatment is started as soon as possible and given for seven to ten days, since it makes a substantial difference to a genuinely unpleasant illness.

Suppressive therapy is usually reviewed after a year or so, because outbreak frequency declines naturally and many people find they no longer need it. It is safe for long-term use, with a good record over decades.

🤝 Transmission, in realistic terms

Understanding actual risk replaces a great deal of anxiety with something manageable.

Transmission happens through direct skin-to-skin contact with an area where the virus is present, which may or may not have a visible lesion. It requires intimate contact. Over the course of a year in a couple where one partner has HSV-2 and the other does not, and no precautions are taken, transmission occurs in a minority of couples rather than being inevitable — and every measure below reduces it further.

Many long-term couples live with one partner infected and the other not, without transmission, for years. That is the realistic picture rather than an optimistic one.

🗣️ Telling a partner

For most people this is harder than any symptom, and it is worth addressing directly rather than leaving as an unmentioned problem.

Timing. Before sexual contact, in a calm moment rather than in bed. There is no version of this conversation that improves by being delayed until afterwards.

Framing. Presenting it as a manageable skin condition caused by a very common virus, with a clear plan for reducing risk, produces a different response than presenting it as a confession. The information itself is reassuring — it is common, treatable, risk can be substantially reduced, and it does not affect fertility or long-term health.

Expectations. Most people react far better than anticipated. Many will disclose something themselves. Some will need time to read about it. A partner who reacts with rejection is telling you something useful about them.

The emotional side is legitimate. Studies of people newly diagnosed find genuine distress, shame and anxiety about future relationships, usually most intense in the first months and settling substantially over the following year. Talking to a clinician who knows the field, or to a support organisation, helps considerably more than reading forums, where the most distressed voices are naturally the loudest.

🤰 Pregnancy

Neonatal herpes is rare and serious, and the risk pattern is the opposite of what most people assume.

The highest risk is a woman acquiring herpes for the first time late in pregnancy, particularly in the third trimester, because she has not yet developed antibodies to pass to the baby and viral shedding is heaviest in early infection. In that situation the risk of transmission during vaginal delivery is substantial, and caesarean section is usually recommended.

A woman with established genital herpes from before pregnancy has a very low risk, because her antibodies cross the placenta and protect the baby. Recurrences during pregnancy do not carry the same danger, and vaginal delivery is generally appropriate provided there is no active lesion at the time.

Practical points that follow:

• Suppressive antiviral therapy from around thirty-six weeks reduces outbreaks at delivery and the need for caesarean section in women with recurrent herpes
• A woman without herpes whose partner has it should take particular care in the third trimester, including condoms and abstaining from sex if the partner has an outbreak, and avoiding oral sex if the partner gets cold sores
• Tell the maternity team about a herpes history, including a partner history, so the pregnancy is managed appropriately
• Antivirals used in pregnancy have a long safety record

❌ Myths worth dismantling

You cannot catch genital herpes from toilet seats, towels, swimming pools or shared bedding. The virus is fragile outside the body and dies rapidly on surfaces. It requires direct skin-to-skin contact. The claim that it spreads through household items appears in a great deal of older writing and causes entirely unnecessary fear within families.

Having herpes does not mean being contagious all the time. Shedding occurs on a minority of days, decreasing over the years, and is reduced further by suppressive therapy.

It does not affect fertility, and it does not cause cancer. Cervical cancer is caused by human papillomavirus, an entirely different virus, and the two are frequently confused.

Cold sores and genital herpes are the same family of virus, which means oral sex during a cold sore can transmit HSV-1 to the genitals. This is now a leading route of genital herpes acquisition and is widely unappreciated.

No supplement, diet or alternative therapy cures herpes. Products claiming to eliminate the virus are selling something that does not exist, and they are marketed aggressively to precisely the people most vulnerable to that promise. Lysine has been studied with unimpressive results.

🧘 Living with it

Beyond medication, several things help.

Identify triggers. Common ones include illness and fever, physical exhaustion, significant stress, friction from sex, menstruation, and ultraviolet exposure. Recognising a personal pattern makes outbreaks predictable rather than random.

Manage a current outbreak simply. Keep the area clean and dry, wear loose cotton clothing, use salt water bathing for comfort, take pain relief, and urinate in a warm bath or while pouring water if urination is painful.

Start treatment at the warning sensation rather than after blisters form. This is the single practical change that most improves episodic treatment, and it means keeping a supply available rather than seeking a prescription each time.

Review suppressive therapy periodically. After a year, many people find their outbreak frequency has fallen enough that they no longer need daily medication.

Expect improvement. The natural course is toward fewer and milder episodes. The first year is usually the most active, and both outbreaks and shedding decline over subsequent years.

Antiviral treatment for genital herpes is stocked in the antiviral category, including Valtrex (valacyclovir), which is used both episodically and as daily suppressive therapy. Which approach suits depends on outbreak frequency and on whether reducing transmission to a partner is a goal.

❓ Frequently asked questions

📑 Sources and editorial

• CDC Sexually Transmitted Infections Treatment Guidelines — genital herpes
• British Association for Sexual Health and HIV guideline for the management of anogenital herpes
• WHO estimates of global herpes simplex virus prevalence
• Corey L et al. — randomised trial of once-daily valacyclovir to reduce transmission of genital herpes
• Professional guidance against the use of HSV IgM serology
• RCOG and ACOG guidance on genital herpes in pregnancy and prevention of neonatal herpes
• FDA prescribing information for valacyclovir, acyclovir and famciclovir
• Related products: antiviral category
• RXshop Editorial Team — reviewed by Emily Chen, MD, MPH, Internal Medicine