Immunizations have helped children stay healthy for more than 50 years. They are safe and they work. In fact, serious side effects are no more common than those from other types of medication. Vaccinations have reduced the number of infections from vaccine-preventable diseases by more than 90%! Yet many parents still question their safety because of misinformation they've received. That's why it's important to turn to a reliable and trusted source, including your child's doctor, for information. The following are answers to common questions parents have about immunizations.