The MMR vaccine protects children from three serious viruses. Measles can lead to ear infection, pneumonia, seizures, brain damage and even death. Mumps can lead to deafness, painful swelling of the testicles or ovaries and sterility. If a woman contracts rubella while she is pregnant, it can lead to miscarriage or birth defects. All of these viruses are spread through the air. Vaccines are given in two doses: at 12 to 15 months old and at 4 to 6 years old.
