Mother with chicken pox delivers after 2 weeks of acquisition, what intervention is necessary for the newborn?
**Core Concept**
The question requires knowledge of neonatal varicella, a condition where a newborn is exposed to varicella-zoster virus (VZV) from an infected mother during pregnancy or childbirth. This can lead to severe complications in the newborn, including congenital varicella syndrome or neonatal varicella.
**Why the Correct Answer is Right**
Varicella-zoster virus can cause significant morbidity and mortality in the neonate if not managed appropriately. The correct answer is based on the understanding that intravenous immunoglobulin (IVIG) has been shown to be effective in reducing the severity of neonatal varicella. IVIG contains antibodies against VZV and can help neutralize the virus, thereby reducing the risk of severe disease in the newborn. The administration of IVIG is recommended for newborns exposed to varicella-zoster virus within 5 days of birth or within 5 days of the onset of rash in the mother.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because antiviral medications such as acyclovir are not the primary treatment for neonatal varicella. While acyclovir may be used in certain situations, IVIG is the preferred intervention for reducing the severity of neonatal varicella.
**Option B:** This option is incorrect because vaccination against varicella-zoster virus is not effective in preventing neonatal varicella if the mother is infected during pregnancy or childbirth.
**Option C:** This option is incorrect because isolation of the newborn is not a specific intervention for neonatal varicella and will not affect the severity of the disease.
**Clinical Pearl / High-Yield Fact**
Neonatal varicella is a medical emergency that requires prompt recognition and treatment. The administration of IVIG within 5 days of birth or within 5 days of the onset of rash in the mother can significantly reduce the risk of severe disease in the newborn.
**Correct Answer:** A. Intravenous immunoglobulin (IVIG) is the necessary intervention for the newborn in this scenario.