Rubella: A viral infection caused by the rubella virus, usually mild with symptoms like low fever, swollen lymph nodes, and a rash on the face and body. It's especially dangerous for pregnant women as it can cause congenital defects in the fetus.

Measles: A highly contagious disease caused by the measles virus, characterized by high fever, cough, runny nose, conjunctivitis, and a widespread rash.