**Question:** False regarding Neonatal herpes simplex infection is:

A. Neonatal herpes simplex infection is extremely rare in developed countries.
B. Neonatal herpes simplex infection is always fatal.
C. Neonatal herpes simplex infection is primarily caused by the varicella-zoster virus.
D. Neonatal herpes simplex infection only affects infants born to mothers with herpes simplex virus (HSV) infection.

**Core Concept:** Neonatal herpes simplex infection is a serious complication of primary HSV infection in pregnant women. HSV is a common human herpesvirus causing both mucocutaneous and systemic infections. Neonatal herpes can be caused by either HSV-1 or HSV-2.

**Why the Correct Answer is Right:** Neonatal herpes simplex infection is not extremely rare in developed countries, but it can occur even in highly vaccinated populations. Primary HSV infection in pregnant women can lead to congenitally acquired HSV infection in the newborn. The infection can manifest as mucocutaneous disease or disseminated systemic disease, with high morbidity and mortality.

**Why Each Wrong Option is Incorrect:**

A. False: Neonatal herpes simplex infection is not extremely rare, and can occur despite vaccination efforts.
B. False: Neonatal herpes simplex infection can have varying outcomes, not always fatal, and treatment with antiviral agents can improve survival rates.
C. False: Neonatal herpes simplex infection is primarily caused by HSV-1 or HSV-2, not by the varicella-zoster virus.
D. False: Neonatal herpes simplex infection can occur in infants born to mothers with primary HSV infection, not just those with varicella-zoster virus infection.

**Clinical Pearl:** Early diagnosis and antiviral therapy are crucial in improving the outcomes of neonatal herpes simplex infection. Regular prenatal screening for HSV and proper counselling of pregnant women can help prevent neonatal herpes.