Immunization is one of the most effective ways to protect against infectious diseases. Vaccines have saved millions of lives worldwide and millions of dollars in unnecessary health care costs. Unfortunately, each year thousands of people still die of vaccine-preventable diseases. IDSA is working to ensure that immunization programs are established, maintained and funded, and that research and development of new vaccines continues. IDSA also seeks to strengthen adult and adolescent immunization coverage and mandate influenza immunization of health care personnel.