Which one of the following hepatitis viruses have significant prenatal transmission ?
**Core Concept**
The question is testing the understanding of hepatitis viruses and their modes of transmission, specifically prenatal transmission. Prenatal transmission refers to the vertical transmission of a disease from mother to fetus during pregnancy.
**Why the Correct Answer is Right**
Hepatitis B virus (HBV) is known to have significant prenatal transmission. The virus can be transmitted from an infected mother to her newborn during birth, resulting in perinatal transmission. This occurs when the virus is present in the mother's blood and is transmitted to the fetus through the placenta or during delivery. The risk of perinatal transmission is high if the mother is HBV e-antigen (HBeAg) positive. The HBV surface antigen (HBsAg) and HBeAg status of the mother are crucial in determining the risk of transmission to the newborn.
**Why Each Wrong Option is Incorrect**
**Option A:** Hepatitis A virus (HAV) is primarily transmitted through the fecal-oral route and is not typically associated with prenatal transmission.
**Option B:** Hepatitis C virus (HCV) can be transmitted vertically from mother to child, but the risk is much lower than that of HBV.
**Option D:** Hepatitis D virus (HDV) requires the presence of HBV to replicate and is transmitted through contact with infected blood or bodily fluids, not typically through prenatal transmission.
**Clinical Pearl / High-Yield Fact**
In areas with high prevalence of HBV, universal vaccination of newborns at birth is recommended to prevent perinatal transmission and HBV-related liver disease later in life.
**Correct Answer: C. Hepatitis B virus (HBV).**