In general, its best to wait until after the scabs and sores completely disappear before you kiss someone or engage in oral sex. This is because the herpes virus can continue shedding in the late stages of a cold sore healing, even if theres no viral fluid present.

Can a person be immune to cold sores?

In Short, No, You Cant Be Immune to Herpes Current scientific research shows that herpes is highly contagious and that everyone is at risk of infection. Its also extremely common, infecting anywhere from more than 50% of people (in the case of HSV-1) to around 11% of people (in the case of HSV-2).