These viruses look identical under the microscope, and either type can infect the mouth or genitals. In the 1960's, the distinction was made that HSV-1 occurs above the waist, and HSV-2 below, but genital HSV-1 infections are increasing.
Herpes Simplex Type 1 (HSV-1) is the virus usually responsible for oral herpes or cold sores. If you receive unprotected oral sex from someone who has (HSV-1) cold sores, you can get genital herpes, or HSV-1 on your genitals.
Herpes Simplex Type 2 (HSV-2) or genital herpes is usually below the waist, but if you perform oral sex on someone who has HSV-2 genital sores, you can get HSV-2 on your face and mouth area.
HSV can also infect other parts of the body. Some other areas could be the eyes and the brain. Herpes Encephalitis is herpes in the brain. Very rare, and only affecting 2 per million, encephalitis is very dangerous and can cause a sore throat, headache, fever, vomitng, coma, and even death if left untreated.
Symptoms and signs of a reactivation include eye pain , blurred vision, tearing, redness, and sensitivity to bright light. Rarely, the infection worsens and the cornea swells, making vision even more hazy. The more frequently the infection recurs, the more likely there is to be further damage to the cornea. Several recurrences may result in the formation of deep ulcers, permanent scarring, and a loss of feeling when the eye is touched. The herpes simplex virus may also cause blood vessels to grow into the cornea, and this alone can lead to significant visual impairment.