Genital ulceration caused by herpes simplex viruses is the most
commonly reported sexually transmitted disease.
Genital herpes infection has historically been associated with
herpes simplex virus type 2 (HSV-2) but there is increasing evidence
that cases of HSV-1 genital infection are becoming more common.
Varicella zoster virus (VZV) also causes about 3% of cases (Birch
2003).
Analysis of the HSV types causing genital lesions collected at
VIDRL since 1980 has shown a significant increase in the proportion
of HSV-1 (rising from 16% in 1980 to 35% in 2003). The increase
has occurred in males and females, and affects all age-groups.
Young people aged under 20 who seek treatment for genital infection
are more likely to have HSV-1 than HSV-2.
