Parvovirus B-19 does not cause:
**Core Concept**
Parvovirus B-19 is a small, single-stranded DNA virus that primarily affects erythroid progenitor cells in the bone marrow. This leads to a range of clinical manifestations, from mild self-limiting disease to severe anemia and hydrops fetalis in pregnant women.
**Why the Correct Answer is Right**
Parvovirus B-19 causes Fifth disease, also known as erythema infectiosum, which is characterized by a distinctive "slapped-cheek" rash, fever, and mild respiratory symptoms. The virus also causes mild to moderate anemia, particularly in individuals with underlying hemolytic disorders or in pregnant women. The anemia is due to the virus's ability to infect erythroid progenitor cells, leading to their premature destruction and a decrease in the production of red blood cells.
**Why Each Wrong Option is Incorrect**
**Option A:** Parvovirus B-19 can cause fifth disease, which includes symptoms like a "slapped-cheek" rash, fever, and mild respiratory symptoms.
**Option B:** Parvovirus B-19 is known to cause mild to moderate anemia, particularly in individuals with underlying hemolytic disorders or in pregnant women.
**Option C:** Parvovirus B-19 can lead to a range of clinical manifestations, including mild self-limiting disease, severe anemia, and hydrops fetalis in pregnant women.
**Clinical Pearl / High-Yield Fact**
Parvovirus B-19 can be transmitted through respiratory droplets, and outbreaks often occur in schools and childcare settings. Pregnant women, individuals with underlying hemolytic disorders, and immunocompromised individuals are at increased risk of severe disease.
**Correct Answer:** A.