Herpes Contagious Period: When Is It Safe?

Herpes (HSV-1 oral, HSV-2 genital) is contagious whenever the virus is shedding—which includes:

• Active lesions: Vesicles, ulcers, crusts — high viral load.
• Prodrome: Tingling, itching before visible sore — shedding begins.
• Asymptomatic shedding: 10–20% of days in seropositive persons; no symptoms, but virus detectable on mucosa.

Transmission Risk Timeline

• Most infectious: Vesicle → ulcer stage (fluid rich in virions).
• Declining: Crusted lesions — still infectious until epithelium fully intact.
• Baseline: Asymptomatic shedding persists lifelong, intermittently.

Precautions

• Avoid contact (kissing, oral/genital sex) during prodrome + lesions + 7 days after healing.
• Condoms/dental dams reduce but don't eliminate genital transmission.
• Daily suppressive antiviral (valacyclovir 500–1000 mg) ↓ shedding by ~70–80% and transmission by ~50%.
• Don't share towels, razors, lip products during outbreak.
• Hand hygiene after touching lesions.

There is no "safe" period with zero risk, but suppressive therapy + barrier use + avoidance during outbreaks minimizes it.