What is the primary cause of Herpes Simplex infections?

Herpes Simplex infections are primarily caused by a viral infection, specifically the Herpes Simplex Virus (HSV). This virus exists in two strains: HSV-1, which commonly causes oral herpes, and HSV-2, associated with genital herpes. The transmission of the virus typically occurs through direct contact with an infected person, especially via skin-to-skin contact during outbreaks.

In the context of this question, the viral nature of Herpes Simplex is critical to understanding how the infection spreads and how it can be treated. Antiviral medications are often prescribed to manage the symptoms and frequency of outbreaks, highlighting the role of the virus in the disease process. The other options—bacterial, fungal, and parasitic infections—represent different types of pathogens that cause a variety of illnesses but are not responsible for Herpes Simplex infections.