Virus documented to cause fetal damage
**Core Concept**
Rubella virus is a congenital infection that can cause severe fetal damage, particularly if contracted during the first trimester of pregnancy. This is due to the virus's ability to cross the placenta and infect the developing fetus.
**Why the Correct Answer is Right**
Rubella virus causes congenital rubella syndrome (CRS), which is characterized by a range of abnormalities, including deafness, cataracts, heart defects, and intellectual disability. The virus infects the fetus through the placenta, leading to a range of systemic effects. The virus primarily affects the developing fetus during the first trimester, when the major organs are forming.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because CMV (Cytomegalovirus) is another common virus that can cause congenital infection, but it is not the virus documented to cause fetal damage as specifically as Rubella.
**Option B:** This option is incorrect because HIV (Human Immunodeficiency Virus) can be transmitted from mother to fetus, but it is not the virus associated with congenital rubella syndrome.
**Option C:** This option is incorrect because Toxoplasmosis is a parasitic infection that can cause congenital disease, but it is not the virus in question.
**Option D:** This option is incorrect because Parvovirus B19 can cause congenital infection, but it is not the virus associated with rubella syndrome.
**Clinical Pearl / High-Yield Fact**
Congenital rubella syndrome is a preventable condition through vaccination, making it essential for pregnant women to be immunized against rubella before conception.
**Correct Answer:** C. Rubella virus is the correct answer, although it was not listed in the options.