Picture of Herpes Simplex Virus Type 1
In rare cases, as when someone's immune system is severely compromised, this virus can cause infection of the brain (encephalitis).
Herpes simplex type 1 is also known as human herpesvirus 1 (HHV-1).
Facts About Sexually Transmitted Diseases
Text: MedTerms™ Medical Dictionary by MedicineNet, Inc.