Herpes Simplex Type 1 Underlying Cause
Herpes simplex has two main forms: type 1 and type 2. Herpes simplex type 2 causes herpes genitalis. The virus enters the body when the mouth comes in contact with saliva from someone who is infected by the virus. Once the initial infection occurs, the virus remains inside the body for life.
- Amir J, Harel L, Smetana Z, Varsano I. The natural history of primary herpes simplex type 1 gingivostomatitis in children. Pediatr Dermatol. 1999 Jul-Aug;16(4):259-63. 
- Frenkel LM. Herpes Simplex Virus Infections in Adolescents. Adolesc Med. 1995 Feb;6(1):65-78.