There is no treatment for polio. It is very dangerous to children under age five. Measles causes a high fever, rash and cold-like symptoms. It can lead to hearing loss, breathing and lung problems, brain damage, and even death. Measles spreads so easily that child who has not been immunized will most likely get it.
Mumps can cause headache, fever, and swelling of the cheeks and jaw.
It spreads from person to person very easily, through coughing, sneezing, or just talking. The greatest danger from rubella is to unborn babies. Pregnant women who get rubella can lose their babies, or have babies with severe birth defects.