Rubella causes all except –
**Core Concept**
Rubella, also known as German measles, is a viral infection caused by the rubella virus. It primarily affects the respiratory system and is characterized by a low-grade fever, sore throat, and a distinctive rash.
**Why the Correct Answer is Right**
The rubella virus affects the immune system, leading to a decrease in the production of antibodies. This results in a higher susceptibility to other infections, particularly those caused by live attenuated vaccines, such as measles and mumps. The virus also has teratogenic effects, particularly during the first trimester of pregnancy, leading to congenital rubella syndrome (CRS) in the fetus.
**Why Each Wrong Option is Incorrect**
**Option A:** Congenital heart block – While congenital heart block can be associated with maternal rubella, it is more commonly linked to other conditions such as autoimmune disorders.
**Option B:** Thrombocytopenia – Thrombocytopenia is not a direct consequence of rubella infection.
**Option C:** Arthritis – Joint symptoms can occur in adults infected with rubella, but they are not as common as in other viral infections.
**Clinical Pearl / High-Yield Fact**
Rubella infection during pregnancy can lead to congenital rubella syndrome, which is characterized by a range of complications, including hearing loss, cataracts, and intellectual disability.
**Correct Answer:** C. Arthritis