Regarding herpes simplex virus (HSV) infection of the skin, all of the following statements are correct EXCEPT:

Question

Accepted Answer

C. Tzanck smear shows multinucleated giant cells and is diagnostic of HSV infection with 100% specificity. ## Analysis of HSV Skin Infection Statements

### Correct Statements (Options 0, 1, 3)

**Option 0 — Primary vs Recurrent HSV**
- Primary HSV: often asymptomatic or mild; may present with systemic symptoms (fever, malaise, lymphadenopathy)
- Recurrent HSV: preceded by prodromal symptoms (burning, tingling, pain) at the site of reactivation
- This distinction is clinically important for patient counseling

**Option 1 — Transmission Routes**
- HSV-1: respiratory droplets, oral secretions, saliva → oral herpes most common
- HSV-2: sexually transmitted → genital herpes most common
- Cross-infection can occur but the stated pattern is the epidemiological norm

**Option 3 — Recurrence Pattern**
- Latency: virus resides in sensory nerve ganglia (trigeminal for orofacial HSV-1; sacral for genital HSV-2)
- Reactivation triggered by stress, immunosuppression, fever, UV exposure, menstruation
- Lesions typically recur in the same dermatome/anatomical area

### Incorrect Statement (Option 2) — **The Answer**

**Key Point:** Tzanck smear is a rapid, inexpensive screening tool but is **NOT diagnostic with 100% specificity**.

| Feature | Tzanck Smear |
|---------|---------------|
| **Sensitivity** | 60–80% |
| **Specificity** | 50–80% |
| **Finding** | Multinucleated giant cells, acantholysis |
| **Limitation** | Cannot differentiate HSV from VZV; both show identical cytopathic changes |
| **Gold standard** | PCR, viral culture, HSV serology |

**Warning:** Tzanck smear shows the same multinucleated giant cells in both HSV and varicella-zoster virus (VZV) infections — it cannot distinguish between them. Specificity is therefore limited to "herpesvirus infection," not HSV specifically.

**Clinical Pearl:** Tzanck smear is useful for rapid bedside diagnosis of herpesvirus infection in resource-limited settings, but confirmatory testing (PCR, culture) is needed for HSV-specific diagnosis and antiviral therapy decisions.

**High-Yield:** For NEET PG, remember: Tzanck = fast but not specific; PCR = gold standard for HSV vs VZV differentiation.

Answer

A. Primary HSV infection is often asymptomatic or causes mild symptoms, whereas recurrent infection typically presents with prodromal symptoms such as burning or tingling

Answer

B. HSV-1 is transmitted primarily through respiratory droplets and oral secretions, while HSV-2 is almost exclusively sexually transmitted

Answer

D. Recurrent HSV lesions are preceded by reactivation of latent virus in sensory nerve ganglia and typically appear in the same anatomical location

Regarding herpes simplex virus (HSV) infection of the skin, all of the following statements are correct EXCEPT:

Explanation

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