Genital herpes simplex virus (HSV) infections are frequently asymptomatic or undiagnosed, but more than half the US population is seropositive for HSV, and about one-fifth are positive for HSV-2.
Cold sores are small blisters around the mouth. They are also called fever blisters. They are caused by the herpes simplex virus. The most common strain of the virus causing cold sores is herpes ...