Can Herpes Be Dormant or Spread With No Symptoms?

Many people picture herpes as something you can always see. In reality, a lot of people carry the virus without ever noticing a sore, and the virus can stay quiet for long stretches. That is also why a positive result can feel confusing: “I’ve never had symptoms, so where did this come from?”

Can herpes be dormant?

Yes. After the first infection, herpes simplex virus (HSV) lives inside nerve cells. The World Health Organization describes it as alternating between being inactive and active, so it can stay quiet for long periods.

When the virus becomes active, it can cause painful blisters or ulcers. Sometimes it reaches the skin and causes nothing visible at all.

How long can herpes stay dormant?

There is no fixed time. Most people have no symptoms or only mild ones, and many people aren’t aware they have the infection.

This is why a single outbreak doesn’t tell you when you were infected. Only a clinician can help you work out what a test result means for you.

Can you have herpes and never have an outbreak?

Yes, and it is common. CDC notes that the majority of people with HSV-2 genital herpes have not been diagnosed, and many have mild or unrecognised infections.

So someone can test positive, or pass the virus on, without ever having been told they had a clear outbreak.

Can you pass herpes on without an outbreak?

Yes. When the virus becomes active on the skin without causing a visible sore, that is called asymptomatic shedding. The WHO notes that both HSV-1 and HSV-2 can be transmitted when no symptoms are felt or visible.

A few things are worth knowing:

• The greatest risk of transmission is when active sores are present, so the risk without sores is lower, but it is not zero.
• CDC notes that asymptomatic shedding is most frequent during the first 12 months after acquiring HSV-2.
• CDC notes that recurrences and shedding are more frequent with HSV-2 genital infection than with HSV-1 genital infection.
• Because it can’t be seen or felt, you can’t reliably tell when it is happening.

What lowers the chance of passing it on?

No method removes the risk completely, but these can all help:

• Avoid sex when you have symptoms, and abstain while prodromal tingling is present. CDC advises avoiding sexual activity during lesions or prodromal symptoms.
• Use condoms. CDC notes that consistent and correct condom use can reduce, but not eliminate, the risk of genital herpes transmission.
• Ask a clinician about daily antiviral medicine. CDC notes that daily valacyclovir reduced HSV-2 transmission in discordant couples, and that suppressive therapy reduces recurrences. A clinician decides whether it is right for you.
• Tell new partners. It is an uncomfortable talk, but it lets both of you decide together how to lower the risk.

Can herpes be tested for if I have no symptoms?

It depends on what you are trying to find out. A swab only works when there is a sore to swab. CDC notes that swabs taken without lesions should not be used to diagnose genital HSV, because sensitivity is low.

A type-specific blood test can show past infection, but it may miss a very recent one. CDC notes that HSV-2 blood screening is not recommended for the general population, so think about what a result would and would not tell you before you decide. If you do test, you can order a blood test online.

What if I’m pregnant or have a weakened immune system?

Tell your prenatal clinician if you or a partner has herpes, even if you have never had symptoms. The WHO advises pregnant women with symptoms to inform their health care providers. If your immune system is weakened, the WHO notes that herpes can have more severe symptoms and more frequent recurrences, so it is worth speaking with a clinician.

Herpes is a common infection, and it is treatable, although it can’t be cured. Understanding how it behaves in the body makes it easier to talk about and to plan around.