Congenital varicella zoster infection causes –
**Core Concept**
Congenital varicella zoster infection refers to the transmission of the varicella-zoster virus (VZV) from a mother with chickenpox to her fetus during pregnancy, which can lead to various congenital abnormalities and complications. This condition occurs when the virus infects the fetus before or during birth, causing damage to the developing organs and tissues.
**Why the Correct Answer is Right**
The congenital varicella zoster infection is associated with the development of congenital varicella syndrome (CVS), a rare but serious condition characterized by limb hypoplasia (underdevelopment), cutaneous scars, and other systemic abnormalities. The pathogenesis of CVS involves the direct cytopathic effects of VZV on the fetal tissues, leading to the disruption of normal fetal development. The virus can infect the placenta, fetal liver, and other organs, causing damage and leading to the characteristic features of CVS.
**Why Each Wrong Option is Incorrect**
* **Option A:** This is not a recognized consequence of congenital varicella zoster infection. While VZV can cause neurological complications in immunocompromised individuals, it is not typically associated with the development of acquired immunodeficiency syndrome (AIDS).
* **Option B:** Congenital rubella syndrome (CRS) is a different condition caused by the rubella virus, which can lead to a range of congenital abnormalities, including heart defects, hearing loss, and vision impairment. While both CRS and CVS are congenital infections, they have distinct clinical and pathological features.
* **Option C:** Congenital toxoplasmosis is a separate condition caused by the Toxoplasma gondii parasite, which can lead to a range of congenital abnormalities, including vision impairment, hearing loss, and intellectual disability. While both conditions are congenital infections, they have distinct clinical and pathological features.
**Clinical Pearl / High-Yield Fact**
The risk of congenital varicella syndrome is highest when the mother develops chickenpox during the first 20 weeks of pregnancy, particularly between 13 and 20 weeks. This is a critical period of fetal development, and the virus can cause significant damage to the developing organs and tissues.
**Correct Answer:** C.