and a genital herpes
infection are caused by the herpes simplex virus. The virus sometimes infects other parts of the body, including the eyes (keratitis) and brain (Herpes simplex encephalitis). Herpes encephalitis is rare, but it has the potential to cause significant brain damage or death.
Traditionally, HSV-1 has been known to be associated with orolabial herpes and HSV-2 with genital herpes. However, investigations have amply documented the increased trend of genital HSV-1 in many parts of the world.Chickenpox
in children (but can also occur in adults) and shingles
in adults are caused by the Varicella-zoster virus. Chickenpox is due to an initial infection with varicella zoster virus (VZV). Once chickenpox has resolved, the virus may remain inactive in nerve cells. Herpes zoster (shingles)
, a painful, blistering skin rash, is due to a reactivation of varicella zoster virus (VZV) within a person's body. Risk factors for reactivation include older age, poor immune function, and having had chickenpox before 18 months of age.