Cold Sore Prevention: How to Avoid Spreading HSV-1 Through Contact and Personal Items

Herpes simplex virus type 1 (HSV-1) causes cold sores (herpes labialis). It spreads via direct contact with infected saliva or lesions.

Preventing Transmission to Others

• Avoid kissing when a sore is present (prodrome to crusting).
• Do not share drinks, utensils, lip balm, towels, razors, toothbrushes.
• Wash hands after touching the sore or applying medication.
• Avoid touching eyes/genitals after contact (risk of herpetic keratitis, genital herpes).
• Use barriers (dental dams, condoms) for oral sex if either partner has active lesions.
• Cover the sore with a hydrocolloid patch to reduce viral shedding and contact.

If You Have a Cold Sore

• Start antiviral (oral valacyclovir, famciclovir, or topical acyclovir) at first prodrome (tingling) — shortens duration.
• Avoid triggers: UV exposure, stress, fatigue, illness, lip trauma.
• Keep lesion clean; don't pick.

Asymptomatic Shedding

Virus can be shed without visible lesions. Consistent barrier use during oral sex reduces genital HSV-1 transmission risk.