What is a hallmark symptom of congenital rubella?

A hallmark symptom of congenital rubella is cataracts, which can occur as part of a triad of abnormalities commonly associated with the condition, including cardiac defects and auditory problems. Cataracts develop due to the teratogenic effects of the rubella virus during the first trimester of pregnancy, when the fetal eyes are still forming. This can result in a range of eye abnormalities, with cataracts being one of the most notable and visible manifestations.

The presence of cataracts in an infant can serve as a strong indicator of congenital rubella syndrome, especially when combined with other findings. Understanding this relationship helps in early diagnosis and management of affected individuals, emphasizing the importance of maternal immunization against rubella to prevent such outcomes.