I was misdiagnosed for two years, not by one doctor, but by a series of them who looked at my sores, took swabs, and handed me false negatives. And I got my herpes inside a monogamous relationship. There was no high-risk anything happening. There was a virus moving quietly, and a medical system that could not see it even when it was sitting right in front of their faces, on my skin.
That was 36 years ago.
In the 23 years I’ve spent working with people who have this virus, I have watched almost nothing generate more fear than the phrase asymptomatic shedding. And almost nothing gets explained worse, which is saying a lot for herpes, because almost everything gets explained badly.
So let me be clear where I stand before I give you the numbers. Shedding is real. It is the main way this virus moves through the population. And the way it’s currently talked about in clinics and online, both, does far more damage than the shedding itself.
What asymptomatic shedding actually is
Herpes virus does not live on your skin. It lives in a nerve cluster. And it travels down the same nerve pathway each time it reactivates. Most of the time when it makes that trip, nothing appears. No blister, no tenderness, no prodrome. The virus arrives at the skin surface, is present in quantities large enough to be passed to another person, and then it goes quiet again. You feel nothing. You look completely normal. That’s asymptomatic shedding.
There’s no test that tells you this is happening. A PCR swab can confirm shedding on the day it is taken, but that’s a photograph, not a forecast. There’s no way to know on any given morning whether today is one of those days or not.
How often does asymptomatic shedding happen?
Here are the actual numbers, because you deserve the actual numbers rather than a vague warning.
The largest study of its kind followed nearly 500 people who had herpes type two, swabbing them daily. In the people with a history of recognized genital outbreaks, herpes type 2 was detected on about 20% of the days. In people who had never noticed any symptoms at all, it was detected on about 10% of the days. The people who thought they had nothing were shedding roughly on one day out of every 10.
Genital herpes type one behaves differently. In people with the first genital herpes type one infection, shedding was found on about 12% of the days at the 2-month mark, dropping to about 7% by 11 months. It falls away much faster than herpes type 2 in the genitals does.
Oral herpes type one is the type nobody worries about and probably is the one we should worry about the most. Sensitive PCR studies of the mouth find herpes type one of the mouth present far more often than the old culture-based studies suggested. Oral HSV-1 is now the leading cause of new genital herpes infections, transmitted through oral sex by people who have never once thought of themselves as having herpes.
At least 60% of adults carry herpes simplex. Most of them have no idea.
The shedding decreases over time
Yes, and this is the part that gets left out of the frightening nightmare scenarios that are posted online.
Researchers track shedding against time since the first episode. Total shedding occurred on about 34% of the days in people with less than a year from their first outbreak. During that first year, your body has no experience dealing with herpes. It takes four to five months to even start making antibodies. You’re in a pretty vulnerable state. That number decreases to about 21% between one and 9 years in most people, and about 17% at 10 years. Once you’ve had herpes for much more than 10 years, the number can drop significantly, sometimes below 1%.
The first year is the loudest year. It is also the year most people make their most permanent decisions about what their life is going to look like from now on. That’s a really poor combination, and it’s one of the reasons that I ask people not to decide anything important when they’re in the middle of a shock.
But notice that the curve flattens rather than reaching zero. It doesn’t stop. Nobody with this virus can say that they will never, ever shed again.
What is the real transmission risk when you have no symptoms?
In monogamous couples where one partner has herpes type 2 and the other does not, and they do nothing else — they have no precautions, no condoms, no antiviral, nothing — the annual transmission rate runs at about 10% for a man to give it to a woman, male to female, and roughly 4 to 5% the other way around. The difference is anatomy, not morality. Women have more mucous membrane, and they get more microscopic tissue trauma during penetrative sex.
In a study of couples where transmission did occur, despite herpes being fully known and disclosed, about 70% of those transmissions appear to have happened during asymptomatic periods. That 70% figure is the one that circulates. It’s real. What’s left off is the denominator. It describes how transmissions were distributed, not how likely you are to transmit. Roughly one in 10 per year without any precautions at all. It’s a meaningful risk, but it’s not the roulette wheel people picture in their heads at 3 o’clock in the morning.
What the CDC says and where it stops
The CDC’s page on herpes is accurate and thin. It tells you that most people with herpes type 2 have never been diagnosed, that many have mild or unrecognized infections and shed intermittently, and that consequently, most genital herpes is transmitted by people who do not know that they are infected or have no symptoms at the time. All true. And then it stops. And notice it doesn’t talk about herpes type one.
What it doesn’t tell you is what to do with the information as a person rather than a statistic. It does not tell you that shedding drops steeply after the first year. It doesn’t tell you that transmission-reduction evidence for daily suppressive therapy comes only from people with recognized outbreaks, and that its usefulness for people with asymptomatic infections has actually never been studied. The CDC’s own guidelines say so. It doesn’t tell you what your own body has to do with any of it, either.
The silence is where the fear grows and where the forums fill in their blanks with folklore.
The two mistakes doctors make about this
I spent a lot of my time correcting bad information given to my patients by their doctors. And on this subject, the errors run in two different directions.
Some doctors still tell people they cannot pass on herpes to anyone when they’re not having an outbreak. And that’s simply not true. And it has infected an enormous number of people.
Many others exaggerate the hype about asymptomatic shedding and overstate what drug therapy does about it. Daily Valtrex reduced acquisition in partners by 48%. 48% is worth having, but it’s not what most people think when the doctors say the word Valtrex. The same trial worked out that you would need to treat 38 people for a year to prevent even one infection.
Do you see what sits between those two errors and what’s behind it? One tells you nothing is happening. The other tells you something is always happening, and there’s nothing you can do about it but take a pill for the rest of your life. An expensive pill in many cases as well. Neither of them describe your actual situation. Neither of them asks a single question about the body the virus is living in.
What you can actually do
You cannot detect shedding, so trying to time your sex life around it is not a plan. But what you can do is this.
First, learn your prodrome. If you experience any tingling, itching, burning, numbness in places where outbreaks appear, then the virus is already on the move, and it’s the only warning you get.
You can use barriers consistently instead of only when you think you need to. Condoms reduce the risk, but cover only some of the skin involved. An antiviral gel can cover more of the skin involved, and combined with a condom, or a dental dam, or other barrier, is a great combination, in my opinion.
Have a safer-sex conversation, not as a confession. But if you’re about to start a relationship with someone, have a conversation where you both discuss your sexual history and your history of safer-sex practises and your history of testing and your history of STIs, and what safer-sex practises you will adopt as a consensus together without pressure or dread.
And then look at the thing the research does not measure. Every study I’ve quoted here tracks shedding against time and against pharmaceuticals. None of them tracked sleep, food, stress, natural remedies, or shame. Nobody funded that study. But you live in a body where this virus makes its decision about whether to stay quiet, and that’s not nothing.
Where this connects with the work I do
There are no quick fixes here. Anyone who tells you otherwise is selling something dubious.
What I do with patients is look at the whole picture. Diet, immune health, sleep, stress. The emotional weight of carrying this virus. And I build a custom tailor plan around the specific person in front of me. Because no 2 people get herpes the same way.
That work belongs in a conversation, not in an article, and it doesn’t translate into a list of herbs or dosage anyone can just copy off a page.
If anything you’ve read here or heard here has opened a question for you, write to me. I read and respond personally. There’s no charge to ask me a question. And if you ever want to go further, you can book an initial consultation with me, 50 minutes on the phone or video, just you and me. And there are also 100 more answers on my frequently asked question page.
Frequently asked questions
Can I transmit herpes when I have no symptoms?
Yes. The virus reactivates and reaches the skin surface on days when you look and feel completely normal, and it can be passed on during those days. This is the most common way herpes is transmitted.
How many days a year am I shedding?
It depends on your type and how long you’ve had it. HSV-2 is detected on roughly 20% of the days in people with a history of outbreaks, and roughly 10% of the days in people who have never noticed symptoms. Genital HSV-1 sheds less and drops off sharply after the first year.
Does the shedding stop eventually?
Not really. It decreases from about 34% of the days in the first year to about 17% after 10 years. But it doesn’t reach zero. But it can reach a pretty low figure.
Is there a test that tells me when I am shedding?
No. A PCR swab can confirm shedding on the day it’s taken, but there’s no test that predicts tomorrow, and there’s no reliable way to feel it happening.
Do antivirals stop asymptomatic shedding?
They can reduce it. Daily suppressive therapy lowered partner acquisition by about 48% in the largest trial. It does not eliminate shedding, and its effect on transmission in people with asymptomatic infections has never been studied. And, of course, there’s side effects.
You are not a walking hazard
You are a person carrying a virus that the majority of adults on this planet also carry. By the way, also, almost every animal on this planet that has a backbone, and many animals that don’t have a backbone, including earthworms, corals, banana slugs, et cetera. And the fear attached to it is wildly out of proportion to what actually happens.
Learn how your own body behaves. Take the precautions that are yours to take, the ones that work for you, and get on with your life.
I’ve had this virus for 36 years, and I’m at peace with it. Make peace with your virus and more often than not, it will make peace with you.