Herpes simplex is a viral disease from the herpesviridae family caused by both Herpes simplex virus type 1 and type 2. Infection with the herpes virus is categorized into one of several distinct disorders based on the site of infection. Oral herpes, the visible symptoms of which are colloquially called 'cold sores' or 'fever blisters', is an infection of the face or mouth. Oral herpes is the most common form of infection. Genital herpes, known simply as 'herpes', is the second-most common form of herpes. Other disorders such as herpetic whitlow, herpes gladiatorum, ocular herpes, cerebral herpes infection encephalitis, Mollaret's meningitis, neonatal herpes, and possibly Bell's palsy, are all caused by herpes simplex viruses. Herpes viruses cycle between periods of active disease—presenting as blisters containing infectious virus particles—that last 2–21 days, followed by a remission period. Genital herpes, however, is often asymptomatic, though viral shedding may still occur. After initial infection, the viruses are transported along sensory nerves to the sensory nerve cell bodies, where they become latent and reside lifelong.