Vaccinations are used to prevent illenesses such as influenza, measles, and hepatitis B. Vaccines work by stimulating your immune system to recognize and fight specific pathogens (germs), providing immunity without causing the illness itself. Vaccines commonly come in injectable forms. Examples include the diphtheria/ tetanus / pertussis vaccine (Boostrix, Adacel), the measles / mumps / rubella vaccine (MMR II, Priorix), and the influenza vaccine (Fluzone, Flucelvax, FluMist). Your healthcare team can help make sure you're up to date with all recommended vaccinations.