Clinical Symptoms of HSV-2 Infection
HSV-2 infection most commonly presents with vesicular and ulcerative lesions on the genital mucosa, genital skin (penile and labial), and perigenital region, though 80-90% of cases progress subclinically and may become symptomatic at any time. 1
Primary HSV-2 Infection
Primary infection (when an HSV-seronegative person acquires HSV-2) represents the most severe manifestation and typically includes:
- Severe genital lesions following sexual exposure
- Incubation period: 2-10 days (up to 4 weeks) 1
- Systemic symptoms: malaise, fever, localized adenopathy 2
- Anatomical distribution: genitalia, urogenital tract, perianal skin, rectum, buttocks, upper thighs 1
- Lesion progression: patch of redness → papular rash → vesicular rash with clear fluid containing infectious viral particles → shallow ulcers/erosions → crusting → spontaneous healing without scars 1
- Duration: typically less than 10 days (may be prolonged with secondary bacterial infection or immunosuppression) 1
Additional sites of involvement beyond genitals include eyes, oro-pharynx, and rectal mucosa 1
Recurrent HSV-2 Infection
Recurrent episodes result from viral reactivation from latent infection in the sacral ganglia and are characterized by:
- Milder symptoms compared to primary infection 2
- Variable frequency: once every few years to several times per month 1
- Same anatomical location as primary lesions 1
- Classic progression: redness → papules → vesicles → ulcers → crusting → healing 1
Gender-Specific Presentations
Males 1:
- Vesicular/ulcerative lesions on penis, buttocks, or perineum
- Dysuria (especially following treatment for other urethritis)
- History of recurrent vesicular/ulcerative genital skin lesions
Females 1:
- Vesicular/ulcerative lesions on genitals, buttocks, or thighs
- Mucous or purulent vaginal discharge
- History of recurrent vesicular/ulcerative genital skin lesions on genitals, thighs, buttocks, perineum
Critical Clinical Pitfalls
Asymptomatic shedding is common - transmissible virus can be shed without visible lesions, making this the most frequent mode of transmission 2, 3. This explains why 80-90% of genital herpes cases progress subclinically 1.
Initial non-primary infection (when someone with HSV-1 antibodies acquires HSV-2) produces less severe genital infection but still causes recurrences 1.
Serious Complications
HSV-2 meningitis 4:
- Headache, photophobia, fever, meningismus
- CSF lymphocytic pleocytosis with mildly elevated protein and normal glucose
- More common in women
- Requires distinction from HSV encephalitis (much more severe with high neurologic morbidity/mortality)
Disseminated HSV-2 infection 5:
- Rare in adults but can cause hepatitis, encephalitis, sepsis-like illness
- May present in stages: localized mucocutaneous involvement → viral prodrome → organ-threatening disease
- Culture-negative sepsis with transaminitis should raise suspicion
- Requires prompt IV acyclovir
Neonatal herpes and increased HIV acquisition risk represent the most serious public health consequences 1, 2.
Diagnostic Considerations
Clinical diagnosis alone is unreliable - laboratory confirmation should always be sought 1. PCR from intact vesicles is the preferred confirmatory method 2, 3. The clinical presentation can mimic other causes of genital ulceration including syphilis, lymphogranuloma venereum, inflammatory bowel disease, Behçet syndrome, or fixed drug eruption 1.