STI Pathophysiology: Herpes Simplex Virus

STI Pathophysiology

Overview of Herpes Simplex Virus (HSV)

• Types of HSV:
  • HSV-1
  • Typically associated with cold sores/fever blisters.
  • Most commonly found above the waist.
  • HSV-2
  • Primarily affects the genital area, anus, and is most commonly found below the waist.
  • More likely to undergo shedding compared to HSV-1.

Pathophysiology

• Nature of the Virus:
  • Herpes simplex virus is a lifelong virus.
  • Both types can spread through direct contact, even when asymptomatic, particularly during periods of viral shedding.

Stages of HSV Infection

• Duration:
  • The complete cycle of infection may take up to 3 weeks to progress through various stages.
• Stages include:
  1. Prodromal Stage:
  • Initial phase of genital herpes.
  • Patients may experience a burning or itching sensation even if visible lesions have not yet appeared.
  1. Vesicular Stage:
  • Characterized by the emergence of blisters or vesicles.
  • Highly infectious during this stage.
  1. Ulcerative Stage:
  • The vesicles rupture leading to the formation of ulcers.
  • As the lesions progress, they eventually begin to crust over.

Triggers of Herpes Outbreaks

• Herpes outbreaks can be triggered by various factors, including:
  • Stress: Physical or emotional.
  • Trauma: Any physical injury or emotional distress.
  • Menses: Hormonal changes during menstruation can lead to outbreaks.
  • Illness: Other diseases or infections may trigger herpes episodes.
  • Sunburn: Skin irritation can provoke an outbreak.

Potential Complications of HSV

• Serious Complications:
  • Long-term complications of HSV infections can be severe, potentially leading to:
  • Blindness: Particularly if the virus affects the eyes.
  • Encephalitis: Infection of the brain tissues.
  • Aseptic Meningitis: Inflammation of the protective membranes covering the brain and spinal cord, which is not caused by bacterial infection.