What is the primary cause of intellectual disabilities linked to congenital rubella?

The primary cause of intellectual disabilities linked to congenital rubella is indeed related to unvaccinated pregnant mothers. When a pregnant woman contracts rubella, especially during the first trimester, the virus can cross the placenta and affect the developing fetus. This can lead to a range of birth defects, including congenital heart defects, hearing loss, and intellectual disabilities. The rubella vaccine is a critical preventive measure that protects against this virus; therefore, the lack of vaccination in mothers plays a crucial role in the occurrence of these developmental issues in their children.

This connection emphasizes the importance of maternal health and immunization during pregnancy. It is part of public health initiatives to ensure that women of childbearing age are vaccinated against rubella to prevent the associated risks to their future children.