A member asked:

How long before a cold sore appears is the transmission rate high? my friend ate off my plate 10 days before cold sore appeared, is she at high risk?

A doctor has provided 1 answer

Very low risk: Very slim chance of transmission this way. Most people already have hsv 1 anyway. Contagious virus is very numerous at the time of a sore but is also present in small amounts between attacks. Incubation period from time of contact to onset of symptoms is 2 to 12 days.

Answered 8/9/2017

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