Hello, Sorry about this problem. Your baby will have sufficient immunity from mother's blood, transferred during last term as your wife is sure to have antiviral antibodies - most adults have, even without having had any sores.
In any case it is only a fresh newborn is at risk when mother has active lesion at time of vaginal delivery.
Please however observe baby for next few days for any lesion on lips, mouth lining or over cheeks next few days.
If found, please consult your pediatrician.