Generally HSV-1 causes infection above the belt and HSV-2 below the belt. In fact, 40% of clinical isolates from genital sores are HSV-1, and 5% of strains isolated from the facial area are HSV-2. This data is complicated by oral sexual practices.
Following primary infection, 45% of orally infected individuals and 60% of patients with genital herpes will experience recurrences.
The actual frequency of recurrences varies widely between individuals. The mean number of episodes per year is about 1.6.