Genital herpes is a sexually transmitted infection that is caused by the herpes simplex virus (HSV) — the same type of virus that causes cold sores. As many as 1 in 8 sexually active Australian adults have genital herpes. Genital herpes can cause outbreaks of blisters or sores on the genitals and anus. Sep 25, · There are two types of herpes virus: herpes simplex virus type 1 (HSV-1) and herpes simplex virus type 2 (HSV-2).. Experts estimate that a large portion of the world’s population has oral herpes. Sep 10, · Herpes viruses typically infect the oral or genital mucosa. When herpes affects the mouth, it causes the typical "cold sores," which are painful sores or blisters that form on the lips, mouth, or computingagainstcovid19.org to the development of the blisters, there may be a prodrome (early symptoms indicating onset of a particular disease) consisting of an itching, burning, or tingling sensation in the.