Genital herpes remains contagious for the entire duration of an outbreak, from the first tingling sensation through complete healing of all sores. But the harder truth is that contagiousness doesn’t switch off once an outbreak ends. The virus can shed from the skin without any visible symptoms, meaning there is no clean “safe” window that begins the moment sores disappear.
How Long an Outbreak Lasts
A first outbreak is typically the longest and most severe, often lasting two to four weeks from the initial symptoms to full healing. Recurrent outbreaks are shorter, generally resolving in about a week to ten days. The timeline follows a predictable pattern: a prodrome phase of tingling, burning, or itching lasting up to 48 hours, followed by blister formation, ulceration when blisters break open, and finally crusting and healing.
Throughout every one of these stages, the virus is actively present on the skin’s surface and can be transmitted to a partner. The ulceration stage, when open sores are exposed, carries the highest viral load and the greatest risk. Peak viral levels occur around 48 hours after symptoms begin, and in studies of herpes lesions, no virus was detectable beyond 96 hours (four days) from symptom onset in individual sores. However, new sores can continue to appear during an outbreak, resetting that clock.
The safest general rule: you are highly contagious from the moment you feel prodromal symptoms until every sore has fully crusted over and new skin has formed underneath. Any sexual contact during this window carries significant risk.
Why You’re Still Contagious After Sores Heal
This is the part most people don’t expect. Even between outbreaks, the virus periodically reactivates and travels to the skin surface in a process called asymptomatic shedding. There are no sores, no tingling, no warning signs at all, yet the virus is present and transmissible.
How often this happens depends on the type of herpes and how long you’ve had it. People with genital HSV-2 shed the virus on roughly 10% of days when not taking medication, based on daily swab studies in men. Those with genital HSV-1 shed less frequently, at about one-quarter the rate of HSV-2. The difference is significant: HSV-2 produces about 4.4 times more total shedding days than genital HSV-1, and about 14 times more days with visible lesions.
Shedding is also more frequent in the first year after infection and declines over time. People experiencing their very first herpes infection (with no prior exposure to either HSV type) shed the virus on nearly 8% of days in the first year, compared to about 3% for those who already carried one type of HSV before acquiring the other genitally.
What Reduces Transmission Risk
Daily suppressive antiviral therapy cuts viral shedding by about 78%. In clinical studies, people taking daily antivirals shed the virus on roughly 3% of days, compared to 13.5% of days on placebo. That reduction applies to both symptomatic and silent shedding. Suppressive therapy doesn’t eliminate the risk entirely, but it substantially lowers it.
Condoms add another layer of protection, though their effectiveness varies by direction of transmission. When used consistently, condoms reduce per-act transmission risk by 96% from men to women, and by about 65% from women to men. The difference exists because condoms cover the primary shedding site in men more completely than they cover all potential shedding areas in women.
Combining daily antivirals with consistent condom use provides the greatest risk reduction available. Avoiding sex entirely during outbreaks (including the prodromal tingling phase) eliminates the highest-risk encounters.
Recognizing the Prodrome
The prodrome is your earliest warning that an outbreak is starting, and it means you’re already contagious. Common prodromal symptoms include tingling, burning, or itching in the genital area, sometimes accompanied by a dull ache in the thighs or lower back. Some people notice discomfort during urination. These sensations typically begin 24 to 48 hours before blisters appear.
Not everyone gets a clear prodrome every time, and some outbreaks seem to appear without warning. But if you do recognize these early signals, treating them as the start of a contagious period is the practical move.
HSV-1 vs. HSV-2: Shedding Differences
Genital herpes caused by HSV-1 (the type more commonly associated with cold sores) behaves differently from genital HSV-2 in terms of long-term contagiousness. Genital HSV-1 tends to recur less often and sheds less frequently between outbreaks. This is one reason genital HSV-1 is considered less likely to be transmitted to partners over time, though it’s not impossible.
Genital HSV-2, on the other hand, recurs more frequently and sheds on more days per year. People with HSV-2 are more likely to transmit the virus both during and between outbreaks. If you don’t know which type you have, a type-specific blood test can clarify, which helps you and your partner assess ongoing risk more accurately.
The Bottom Line on Timing
During an active outbreak, you are contagious from the first prodromal symptom until all sores have completely healed with new skin. That window is typically one to four weeks depending on whether it’s a first episode or a recurrence. After that, the risk drops significantly but does not reach zero. Asymptomatic shedding means the virus can be present on any given day, even when your skin looks and feels completely normal. Daily antivirals and consistent condom use are the most effective ways to reduce that baseline risk between outbreaks.